I think yes, a couple for business, a couple for games, and so on. One for landings and news, i.e. web. Hint: not a platform itself is important, but sort of regular professional committee behind it. E.g. there is no committee now for even basic UI. Ubuntu has it, Mac/iOS has, even Windows has native look and feel to lesser but noticable extent. Web simply doesn’t. Open Windows SDK for example and feel how many areas are not yet covered and never will with current approach.
Chances are I didn’t understand your second question, but if taken literally: I can’t see how usage control may help. Anyone can use anything at their legal will.
That's not a bad idea, although I don't think you could stop cross-pollination of platforms leading to redundancy and bloat.
Perhaps if there was a single (large, but well-organized) team responsible for all platforms, that could correctly identify which features were needed where.
https://msdn.microsoft.com/en-us/library/windows/desktop/ff8...
Chances are I didn’t understand your second question, but if taken literally: I can’t see how usage control may help. Anyone can use anything at their legal will.