[danielmason]

As someone who's pretty far down the rabbit hole on a bunch of these fronts, I think this is wonderful advice. Many of these are tools to solve very specific problems, and you should make sure you have those problems first.

The only thing I'd differ on is the semantic HTML advice. What you're saying is true modulo accessibility, but accessibility is (well, should be) table stakes for professional work. And while the community has come up with some really nice individual abstractions around tricky a11y concerns, I haven't seen a way to get good results without at least some knowledge of HTML semantics. I'm not implying you don't care about a11y -- it's totally possible I've missed some better ways of doing things.