> Yes, I know some things simply can't be done without a JS webapp, but not all and probably not even a majority, so if HTML and CSS will do the job fine, then so be it; and even if it needs to use JS, it likely doesn't need to be latest-browser-only JS either.
Sticking to HTML and CSS won't necessarily get rid of this - new stuff is being added to CSS all the time, in particular. And browser support is just as patchy.