plotly-extension - lots of warnings when building

[codecachet]

Using a mac, with the following:
node --version
v10.15.3
npm --version
6.4.1
yarn --version
1.15.2

And running install @jupyterlab/plotly-extension

I get:
Deprecation warnings (e.g. Buffer())
Multiple definition warnings (e.g. WARNING in d3-array),
etc.

It ends up working, so I am happy - but I ask: why all the warnings?
And why do I need to build this extension? Why can't it just "install"? Why do I need to run this node process anyway? I am a user, and just want to install an extension. Perhaps the way extensions work in Jupyter Lab needs to change? The complexity requiring a user to do a build I think is just asking for trouble (especially in light of all of the node dependencies and versions etc.). Thanks - the fact that this works is great, and I really like Plotly inside Jupyter. But...install process seems quite brittle.