I'd agree with you but we are not there yet.

I've yet to see a beautiful web app on mobile not be a sluggish buggy mess. Twitter's mobile web app at first look decent but it's sooooo sllllllllooooowww and unresponsive on a quad core phone.

Forecast.io's mobile site is the first time I've seen any app or browser instance cause a phone to lock up and never recover. I'm suspecting that's a GPU driver bug.