.NET Standard 2.0 support for UWP uses APIs for all .NET platforms, including .NET Framework 4.6.1, Mono 5.4 and Xamarin. UWP supports .NET Standard 2.0 which will make it more equal to other .NET implementations.
You can update .NET Standard 2.0 via Visual Studio 2017 15.4 IDE. Developers need to head to Windows 10 Fall Creators Update.
UWP has been criticized for being considered a 'closed platform' and suspected of compatibility. But Microsoft continues to grow, with UWP updates in early 2017 and supporting .NET Standard 2.0 this week.