If you think one gets to know React or Angular because one can follow a "Getting Started" tutorial for a couple of hours and get it to show an example page then you're in Dunning Kruger territory.
The comment I was replying to was saying:
> there is so much js tooling and documentation and of such wide variety that a year or two would not be enough for even a light review
There's no need to learn the entire ever-evolving JS ecosystem. You pick a sane starting point (a framework tutorial) to get you up and running in a few days, and from there you learn what you _need_.
It's a complicated mess and even seasoned JS developers struggle to answer the above questions. Oftentimes the justification for choosing a framework is that they had read about it in a forum like HN and wanted to try it. Nothing wrong with that for someone who lives and breathes those things but most people want to just get a CRUD UI up, these things are a massive time sink for what they purport to offer.
Especially since you suggest that such developers just need to get a CRUD UI up and running. You don't need a js framework for that.