Great feedback, thank you! Linux targeting isn't my area, but I know the guy who owns it would love to chat with you. If you want to help us make this better, would you mind sending me an email at apardoe @ youknowthecompany.com? I totally understand if it's not worth your time. But thank you regardless!
And, of course, VS offers Android and iOS targeting in both C++ and .NET. The C++ info is here: https://blogs.msdn.microsoft.com/vcblog/2017/04/18/android-a...