I don't think it helps that MS have been trying to build new UI and app development frameworks for the past several years, each one with varying capabilities. I

I don't think it helps that MS have been trying to build new UI and app development frameworks for the past several years, each one with varying capabilities. I've lost track, I think UWP is the latest one but it's not UWP any more, or something? It just seems harder to build and sell software that has that same quality look-and-feel that many MacOS apps have. I just wonder what they'd be capable of if they had a separate OS that didn't have to concern itself with backwards compatibility. It'd be a monumental undertaking to do all that from scratch, not really worth it from a business standpoint, but it'd be interesting to see what they'd come up with if they started off with Linux.