A somewhat unrelated conceptual question: if Chrome is putting web apps alongside desktop apps, what does that do for usability of apps on a platform in general? If a web app was created to emulate a native OS UI, wouldn't that be taking a bit of a step backwards (in terms of recreating all the widgets) compared to just coding in the native toolkit in the first place?

I guess what I'm really asking is, what's Google's plan for unifying the Web Store apps visually the way Android and iOS do with their UI kits?