Whats most annoying to me such "onlinedness"/"cloudness" that people (myself including) associate with web apps are not really dependant on the front end being web based. You should be able to build as good collaboration etc features as easily with native apps as with web tech. In mobile the the lines are blurrier, but on desktop there feels to be division between offline native apps and online web apps, with very few bridging the gap with native online apps.