Earlier quoted context omitted.
But again they have no upgrade path. They just produce something new and expect everyone to jump on board. My expectation is that UWP will last 2-3 years and then they will have something else that does the same but in a different way and UWP is in maintenance mode.
You may be confused. .NET Standard 2.0 support for UWP means the upgrade path is (finally) here today. Start a UWP project in VS 2017.4, make sure the project targets the Fall Creator's Update (the Windows 10 feature update to be released at the end of this month), and from that UWP app you can now add a reference to almost anything on NuGet you want. .NET Standard 2.0 support means that if it ran on the .NET Framewo…
Because that was the main limitation of Metro apps, you couldn't really do anything useful with them, you couldn't even access the hard drive normally or edit the windows registry. This is why you couldn't "upgrade". It wasn't an upgrade to any previous tech, it was a downgrade as the platform literally had less capabilities. It is, or at least was, basically a platform for making sandboxed mobile apps that you can run on the desktop...
This is why they clearly weren't (at least Metro, I haven't worked with UWP) an "upgrade" to anything. Silverlight wasn't an "upgrade" to WPF for the exact same reason. It was a more limited platform and you couldn't switch WPF apps over. So MS calling Silverlight or Metro a new version of WPF would have been retarded.