I'm reading over the blog and trying to understand what's happening to WinForms / WPF.

Support for leveraging platform-specific capabilities, such as Windows Forms and WPF on Windows and the native bindings to each native platform from Xamarin.

I am not exactly sure what this means. Will I be able to run a WPF app as-is on Mac / Linux? Or does this mean I can have a non-UI .NET 5 portion of the app with Xamarin UI components for the different platforms? If so, I am not sure what .NET 5 does for me, exactly?

It seems like the easiest way to make a cross platform desktop UI application is to use Java / JavaFX.