"I think UWP apps are already arch-independant and run on NET, which is already open source and I think runs on ARM." This isn't true, though it's a common mis

"I think UWP apps are already arch-independant and run on NET, which is already open source and I think runs on ARM." This isn't true, though it's a common misconception. UWP isn't tied to .NET or any VM. UWP apps can use a VM or use native code, and if they're native they're just as arch-dependent as any native app. The "universal" part comes from them only depending on a subset of Windows APIs which are present on all Windows editions. The desktop edition of Windows already runs on ARM, regardless.