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The complicated CI for Scala 3 which runs many separate compile and test subjobs - while Scala 2 build is not like this at all - I think this might have been useful when Scala 3 support was being added but it is now stable.
The multiple subjobs will have to do a lot of duplicated work. The single subjob will take longer but the PR validation subjob takes ages any way so this won't slow down the build - and makes us better GitHub citizens because we use fewer concurrent VMs and take less compute time in total.