Think some of that (the dialog and friends) is the wrong way around: we wouldn’t have gotten all those nice DOM native components if libraries and frameworks hadn’t popularised them and driven adoption into the standards.

I am not sure I agree “the state of front end development” is due to “functional purism” either. React just provided a good abstraction that worked well for many people. It’s a meritocracy. If the abstraction that worked best (however we measure that) had been something more OOP then that would have been adopted.