I agree with you 100%, especially on the "It just works" point, but you're wrong on the "friends let friends login" thing. As far as i know, no other OS allows me to log into someone else's computer and get the exact same experience i have on my own, and vice versa.
I've always wanted it to work this way. Even just a few years ago, I'd never imagine this would be accomplished by using a browser-based operating system.
