The point I'm making is that when people have tried to develop a UI framework in a single language from scratch and offer the same functionality as the web, the

The point I'm making is that when people have tried to develop a UI framework in a single language from scratch and offer the same functionality as the web, they fail. Performance sucks, or its not flexible enough to deliver certain functionality. By XAML I guess I mean WPF or whatever it is called. The bet was that Silverlight would be installed in every browser and you could build more powerful apps. I remember reading a post about how Evernote rewrote their WPF app because performance was never good enough. GWT tried to make a nicer API for building UIs. The API was nice, but I guess the whole transpilation caused issues with debugging etc. --- HTML, JS, CSS is evolving in such unpredictable ways, each time getting better and better. It just has such a large community using it and experimenting with it all the time - I don't think anyone can compete with the hive mind of web devs.