Well, "yet beautiful and usable" is a matter of opinion. I find the 5 year old iOS UI boring and much less usable than the AOSP Android UI. And this could be

Well, "yet beautiful and usable" is a matter of opinion. I find the 5 year old iOS UI boring and much less usable than the AOSP Android UI. And this could be related to the fact that the Android team is refining the UI with every iteration.