diff --git a/Classes/Mvc/Controller/SimpleActionController.php b/Classes/Mvc/Controller/SimpleActionController.php
deleted file mode 100644
index 35b2e3e596..0000000000
--- a/Classes/Mvc/Controller/SimpleActionController.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-namespace Neos\Flow\Mvc\Controller;
-
-use Neos\Flow\Mvc\ActionRequest;
-use Neos\Flow\Mvc\ActionResponse;
-use Neos\Flow\Mvc\Exception\NoSuchActionException;
-use Neos\Flow\SignalSlot\Exception\InvalidSlotException;
-
-/**
- * Provides most direct access to our request/response abstraction,
- * the request comes directly from the dispatcher and goes directly back to it.
- *
- * For helpers to facilitate throws, forwards, redirects:
- * @see SpecialResponsesSupport
- *
- * Views or other processing needs to be added to your controller as needed,
- * helpers will be suggested here as they become available.
- */
-class SimpleActionController implements ControllerInterface
-{
-    /**
-     * @param ActionRequest $request
-     * @return ActionResponse
-     * @throws NoSuchActionException
-     * @throws InvalidSlotException
-     */
-    public function processRequest(ActionRequest $request): ActionResponse
-    {
-        $request->setDispatched(true);
-        $actionMethodName = $this->resolveActionMethodName($request);
-        return $this->$actionMethodName($request);
-    }
-
-    /**
-     * Resolves and checks the current action method name
-     *
-     * @return string Method name of the current action
-     * @throws NoSuchActionException
-     */
-    protected function resolveActionMethodName(ActionRequest $request): string
-    {
-        $actionMethodName = $request->getControllerActionName() . 'Action';
-        if (!is_callable([$this, $actionMethodName])) {
-            throw new NoSuchActionException(sprintf('An action "%s" does not exist in controller "%s".', $actionMethodName, get_class($this)), 1186669086);
-        }
-
-        return $actionMethodName;
-    }
-}
diff --git a/Tests/Functional/Mvc/Fixtures/Controller/SimpleActionControllerTestController.php b/Tests/Functional/Mvc/Fixtures/Controller/SimpleActionControllerTestController.php
deleted file mode 100644
index 990b6c2256..0000000000
--- a/Tests/Functional/Mvc/Fixtures/Controller/SimpleActionControllerTestController.php
+++ /dev/null
@@ -1,48 +0,0 @@
-<?php
-namespace Neos\Flow\Tests\Functional\Mvc\Fixtures\Controller;
-
-use Neos\Flow\Mvc\ActionRequest;
-use Neos\Flow\Mvc\ActionResponse;
-use Neos\Flow\Mvc\Controller\SimpleActionController;
-
-/**
- *
- */
-class SimpleActionControllerTestController extends SimpleActionController
-{
-    public function indexAction(ActionRequest $actionRequest): ActionResponse
-    {
-        $response = new ActionResponse();
-        $response->setContent('index');
-
-        return $response;
-    }
-
-    public function simpleReponseAction(ActionRequest $actionRequest): ActionResponse
-    {
-        $response = new ActionResponse();
-        $response->setContent('Simple');
-
-        return $response;
-    }
-
-    public function jsonResponseAction(ActionRequest $actionRequest): ActionResponse
-    {
-        $response = new ActionResponse();
-        $response->setContent(json_encode(['foo' => 'bar', 'baz' => 123]));
-        $response->setContentType('application/json');
-
-        return $response;
-    }
-
-    public function argumentsAction(ActionRequest $actionRequest): ActionResponse
-    {
-        $response = new ActionResponse();
-        $response->setContent(strtolower($actionRequest->getArgument('testArgument')));
-        if ($actionRequest->getFormat() === 'html') {
-            $response->setContentType('text/html');
-        }
-
-        return $response;
-    }
-}
diff --git a/Tests/Functional/Mvc/SimpleActionControllerTest.php b/Tests/Functional/Mvc/SimpleActionControllerTest.php
deleted file mode 100644
index 32e44cf2cc..0000000000
--- a/Tests/Functional/Mvc/SimpleActionControllerTest.php
+++ /dev/null
@@ -1,88 +0,0 @@
-<?php
-namespace Neos\Flow\Tests\Functional\Mvc;
-
-use Neos\Flow\Tests\FunctionalTestCase;
-use Psr\Http\Message\ServerRequestFactoryInterface;
-
-/**
- *
- */
-class SimpleActionControllerTest extends FunctionalTestCase
-{
-    /**
-     * @var ServerRequestFactoryInterface
-     */
-    protected $serverRequestFactory;
-
-    /**
-     * Additional setup: Routes
-     */
-    protected function setUp(): void
-    {
-        parent::setUp();
-
-        $this->registerRoute('test', 'test/mvc/simplecontrollertest(/{@action})', [
-            '@package' => 'Neos.Flow',
-            '@subpackage' => 'Tests\Functional\Mvc\Fixtures',
-            '@controller' => 'SimpleActionControllerTest',
-            '@action' => 'index',
-            '@format' => 'html'
-        ]);
-
-        $this->serverRequestFactory = $this->objectManager->get(ServerRequestFactoryInterface::class);
-    }
-
-    /**
-     * Checks if a simple request is handled correctly. The route matching the
-     * specified URI defines a default action "index" which results in indexAction
-     * being called.
-     *
-     * @test
-     */
-    public function defaultActionSpecifiedInRouteIsCalledAndResponseIsReturned()
-    {
-        $response = $this->browser->request('http://localhost/test/mvc/simplecontrollertest');
-        self::assertEquals(200, $response->getStatusCode());
-        self::assertEquals('index', $response->getBody()->getContents());
-    }
-
-    /**
-     * Checks if a simple request is handled correctly if another than the default
-     * action is specified.
-     *
-     * @test
-     */
-    public function actionSpecifiedInActionRequestIsCalledAndResponseIsReturned()
-    {
-        $response = $this->browser->request('http://localhost/test/mvc/simplecontrollertest/simplereponse');
-        self::assertEquals(200, $response->getStatusCode());
-        self::assertEquals('Simple', $response->getBody()->getContents());
-    }
-
-    /**
-     * Checks if the content type and json content is correctly passed through
-     *
-     * @test
-     */
-    public function responseContainsContentTypeAndContent()
-    {
-        $response = $this->browser->request('http://localhost/test/mvc/simplecontrollertest/jsonresponse');
-        self::assertEquals(200, $response->getStatusCode());
-        self::assertEquals(['application/json'], $response->getHeader('Content-Type'));
-        self::assertEquals(json_encode(['foo' => 'bar', 'baz' => 123]), $response->getBody()->getContents());
-    }
-
-    /**
-     * Checks if arguments and format are passed
-     *
-     * @test
-     */
-    public function responseContainsArgumentContent()
-    {
-        $argument = '<DIV><h1>Some markup</h1></DIV>';
-        $response = $this->browser->request('http://localhost/test/mvc/simplecontrollertest/arguments?testArgument=' . urlencode($argument));
-        self::assertEquals(200, $response->getStatusCode());
-        self::assertEquals(['text/html'], $response->getHeader('Content-Type'));
-        self::assertEquals(strtolower($argument), $response->getBody()->getContents());
-    }
-}
diff --git a/Tests/Unit/Mvc/Controller/Fixtures/SimpleActionTestController.php b/Tests/Unit/Mvc/Controller/Fixtures/SimpleActionTestController.php
deleted file mode 100644
index 4670322eb7..0000000000
--- a/Tests/Unit/Mvc/Controller/Fixtures/SimpleActionTestController.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-namespace Neos\Flow\Tests\Unit\Mvc\Controller\Fixtures;
-
-use Neos\Flow\Mvc\ActionRequest;
-use Neos\Flow\Mvc\ActionResponse;
-use Neos\Flow\Mvc\Controller\SimpleActionController;
-
-/**
- *
- */
-class SimpleActionTestController extends SimpleActionController
-{
-    public function addTestContentAction(ActionRequest $actionRequest): ActionResponse
-    {
-        $response = new ActionResponse();
-        $response->setContent('Simple');
-        return $response;
-    }
-}
diff --git a/Tests/Unit/Mvc/Controller/SimpleActionControllerTest.php b/Tests/Unit/Mvc/Controller/SimpleActionControllerTest.php
deleted file mode 100644
index ba7461a455..0000000000
--- a/Tests/Unit/Mvc/Controller/SimpleActionControllerTest.php
+++ /dev/null
@@ -1,74 +0,0 @@
-<?php
-namespace Neos\Flow\Tests\Unit\Mvc\Controller;
-
-/*
- * This file is part of the Neos.Flow package.
- *
- * (c) Contributors of the Neos Project - www.neos.io
- *
- * This package is Open Source Software. For the full copyright and license
- * information, please view the LICENSE file which was distributed with this
- * source code.
- */
-
-use Neos\Flow\Mvc\ActionRequest;
-use Neos\Flow\Mvc\ActionResponse;
-use Neos\Flow\Mvc\Controller\SimpleActionController;
-use Neos\Flow\Mvc\Exception\NoSuchActionException;
-use Neos\Flow\Tests\UnitTestCase;
-
-/**
- * Tests for
- * @see SimpleActionController
- */
-class SimpleActionControllerTest extends UnitTestCase
-{
-    /**
-     * Note: additional checks like "123" or "Foo" might seem sensible but those cases are prevented in the ActionRequest already.
-     *
-     * @return array[]
-     */
-    public function wrongActionNameDataProvider()
-    {
-        return [
-            ['foo'],
-            ['fooAction'],
-            ['addTestContentAction']
-        ];
-    }
-
-    /**
-     * @test
-     * @dataProvider wrongActionNameDataProvider
-     */
-    public function exceptionIfActionDoesNotExist(string $actionName)
-    {
-        $request = $this->createMock(ActionRequest::class);
-        $request->method('getControllerActionName')->willReturn($actionName);
-
-        $this->expectException(NoSuchActionException::class);
-
-        $testObject = new Fixtures\SimpleActionTestController();
-        $testObject->processRequest($request);
-    }
-
-    /**
-     * @return void
-     * @throws NoSuchActionException
-     * @throws \Neos\Flow\SignalSlot\Exception\InvalidSlotException
-     * @test
-     */
-    public function responseOnlyContainsWhatActionSets()
-    {
-        $request = $this->createMock(ActionRequest::class);
-        $request->method('getControllerActionName')->willReturn('addTestContent');
-
-        $testObject = new Fixtures\SimpleActionTestController();
-        $response = $testObject->processRequest($request);
-        self::assertInstanceOf(ActionResponse::class, $response);
-        self::assertEquals('Simple', $response->getContent());
-        self::assertFalse($response->hasContentType());
-        // default
-        self::assertEquals(200, $response->getStatusCode());
-    }
-}