It does still happen not infrequently on a certain sort of site which I’ll simplify to “marketing homepage”, but it’s not happening anywhere near as often as it did three years ago. I haven’t tried to assess if this is because more-sensible frameworks have gained popularity, or if the stupid frameworks support server-side rendering better now.

Gotta say, though, that I don’t think one actually misses much in such cases.

Of sites that require JS to not be blank and don’t fit into this main category, my vague feeling is that the rate hasn’t changed much.