Far from unnecessary. If your mobile platform is defined in terms of HTML5, it's easy to mix up the layer of mobile platform with the layer of browser user exp

Far from unnecessary. If your mobile platform is defined in terms of HTML5, it's easy to mix up the layer of mobile platform with the layer of browser user experience. The think that probably couldn't technically happen is to install chrome and run firefox OS apps on top of the chrome engine, but that's a completely different issue. (I wrote "probably" because, well, we've seen all kind of hacks and many impossible things will be made)