IMO we're long past the churn era - Svelte itself is 8 years old. There are occasional bursts of new frameworks and tools, but only when there is a new niche - the last one I remember was a few years ago when suddenly everyone wanted to do a static website generator. And that didn't make existing frameworks obsolete.

In my post I was actually speaking about learning CSS and HTML alongside the "real programming language" that is JS/TS.