Comment by jonhmchan

I've been using the hybrid native/web approach to circumvent the downloads as well. I didn't go so far as push actual UI a la HTML to load in a webview, but I made dynamic native UIs that changed according to certain responses made on startup (think sending a news update with a picture url loaded into a UILabel/UIImageView)

The composability point is interesting. I like the idea of dependencies, and I've used url schemes to do it. You can test for whether or not an app is installed (given that it has a scheme) by testing invoking - (BOOL)canOpenURL:(NSURL *)url from UIApplication. Something interesting would be for Apple to require that each app have a custom URL scheme, and possibly generate them from a unique app identifier.