I think you missed my point entirely. The lesson of React and JSX is that separating semantic/visual/interactivity is not actually valuable when building web applications. The valuable separation is component separation. React/JSX nailed that. Previous web development frameworks/libraries were terrible at it (though angularjs gets an honorable mention).

I worked through this whole era when the web platform was figuring this out. Or I should say re-figuring this out, since desktop GUI development had worked it out going back to the late 80s.