> But I won't clutter up my phone with things that work just fine in a browser

That's the window for apps to compete. If "just fine" works for you, cool, but it's possible for apps to make the experience better in meaningful ways. A web page can't notify of you a new message, but an app can, for example. Look at all the Twitter apps that came up, and they've had to start to systematically kill over time because the experiences are _so much_ better than Twitter in the app. "Just fine" doesn't push us forward.