I think you have some good points there. I understand as to why you would say MacOS UI feels more refined, in general, I would rate Apple design language more refined and of higher quality than pretty much anything else.
Unfortionatley when it comes to productivity, beauty is less important than eficiency.
Let me give you a simple example.
Windows has almost no animations. MacOS has some, and iPadOS has quite a lot.
So, iPadOS looks the best in this regard. But, it is also the slowest , since animations take precious seconds off your work. And those seconds compound, but not only that, windows feels snappier - since it really is, whilst on iPad, or even MacOS oftentimes I have to wait for the animation to finish doing it’s thing, so I can continue working
**Window management, clicking, dragging, right mouse click and so on… and especially on iPad.
So that’s just one example, but there are many like it. Windows seems to have been build with a more - get it done efficiently - philosophy, whilst macOS is more in line with - get it done beautifully. Even thou I do appreciate beauty, I like efficiency better when working in a professional setting.
I generally use Edge now, and I like it. It feels fast, simple and stable.