Native UI is vastly more powerful compared to HTML and CSS, which were designed to display web pages, not widgets and controls. In fact I don't understand what

Native UI is vastly more powerful compared to HTML and CSS, which were designed to display web pages, not widgets and controls. In fact I don't understand what kind of experience you have to say something like that. If you were a web designer you would know that the web UI is a painful to use hack. If you were a mobile/desktop developmer you would know that both types of UIs are better at showing pretty much anything on a screen - including a browser engine.