It doesn’t matter if Win32 is superior for power users, the masses don’t need it and don’t want it. They want the simplicity of iOS or Android.
Windows use has been declining among home users for a long time. Should Microsoft just give up? With UWP it at least might stay relevant.
And there will be a “Pro” version of Windows with full Win32 support for a very long time. But without a mass market we won’t have the current multitude of hardware in the future.
A more closed Windows version for the noobs is the best way to ensure the survivsl of an open Windows ecosysyem for the elite!