> lowest common denominator of OS features Not sure I agree here. There are a great many browser features (e.g. web speech api for recognition and tts, webrtc,

> lowest common denominator of OS features Not sure I agree here. There are a great many browser features (e.g. web speech api for recognition and tts, webrtc, etc) that are just not lowest common denominator. Even if we stick with UI only, features like cross platform vector graphics are not trivial. Of course some libs like qt abstract it, but you're back to your same complaint except it's qml, css, and js (or often times worse, c++ if using widgets)