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In UHC, your health doesn't regenerate naturally. The only way to gain health is to craft a golden apple (which requires 8 golden ingots and an apple) or you can also craft a health potion which requires a block of gold, a diamond, a bottle and a rose.
Once there are only 2 players...
It's just a mix up of Android and Windows Phone. The new features they added are also things that Android already had! Current version is much better than their latest UI.
The question is biased, many people like to use multiple platforms, for example people may like to use PC and Xbox 360, plus you didn't include all the platforms (or at least another option for "other").