IF UWP will expand to do that it's not in any announced roadmap (and if it's being discussed internally I'm not privy to such things :) ) whereas Xamarin is do

IF UWP will expand to do that it's not in any announced roadmap (and if it's being discussed internally I'm not privy to such things :) ) whereas Xamarin is doing it now(ish). You are right, the XAML is a bit different, the syntax is the same, but we use different class structures.