I don't have any gripe with it other than one thing:

Lack of widgets. We have people writing emoji pickers in JS and placing them in documents, and some of them work horribly on mobile. Then there's the caveat of emoji pickers being already available on mobile and no such JS widget is needed. Then there's 100+ variations of dropdown menus implemented in JS, which all have their own bugs, don't work well on mobile, and are already somewhat natively available on mobile anyway so the JS widget is not needed.