When I see these kind of super-polished UIs, I wonder why can't we have that in Windows? Or Linux, for that matter, but I get the why on Linux. GUIs are so muc

When I see these kind of super-polished UIs, I wonder why can't we have that in Windows? Or Linux, for that matter, but I get the why on Linux. GUIs are so much better in Mac, it's not even close. What's stopping Microsoft from getting closer?