The bigger problem, though, is all the legacy that's holding it back in the name of backwards compatibility. The WinAPI is older than myself. You can still run Windows 95 programs on your new Windows 10 PC. While useful to some, I'll never understand why exactly is it done this way. Apple keeps dropping old APIs to make their OSes better and simpler internally. I've never used anything that came before OS X, but I did read a lot that it was terrible and unstable, just like Windows at the time. Except modern macOS is stable and robust, while Windows still feels extremely fragile and unreliable after all these years.
Yes, I understand that Microsoft is hellbent that modern Windows versions need to be able to run 25-year-old binaries unmodified. But they could've achieved the exact same thing by putting genuine Windows 95 into a VM and seamlessly integrating it with the desktop.