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Windows isn't a mobile platform. They tried 2.5 times and have given up. In mobile it's iOS and Android, and neither Apple nor Google recognize C# as a first-class language. If you can write a compiler that emits code that LLVM can compile to ARM binary with Xcode or package your MSIL with a micro .NET VM on Android, then more power to you but Apple and Google aren't going to help you if you get stuck.

Windows tablets, laptops and 2-1 devices are quite mobile to me.

Prerty difficult to find a good dash mount, no usb charging, bit bright at night and having to plug in an external gps unit is fairly limiting though.

The car computer already takes care of that.

And an AS/400 was perfectly "mobile" to Arnold S. back in his prime. :-)

Xamarin's "first class" support for Windows is Windows Store only though?

no.

While still in Preview, Xamarin.Forms actually supports Linux with Gtk#, Windows with WPF and UWP and Mac with Cocoa (actually Cocoa with C# does work really well).

The context of the article is about iOS & Android apps, so 1st class support on Windows is nice, but not germane.