I don't have answers to either of your questions, and neither does anybody else. The answers are not going to come from fights about what UI should be, but from

I don't have answers to either of your questions, and neither does anybody else. The answers are not going to come from fights about what UI should be, but from as many OS developers as possible doing as many experiments as possible on the largest number of users possible. My point was that this isn't going to happen if the community continues all of this back biting.