It’s also worth noting that the web technologies were initially (and still mostly, actually) designed to layout documents, not to craft highly graphical, interactive, animated application UIs.

If this is the direction the web is going, I think it’s worth considering a shift to technologies better suited for the task (QML, for instance, looks like a great preexisting application-centric alternative to HTML). Old browsers that don’t support this tech would be taken care of by HTML polyfills until adoption of new browser versions is high enough.