It's probably because MS just changed so much in over the last decade. First they wanted to change everything with Windows 8. That didn't work out, of course. It was a terrible idea to use a tablet OS for desktop PCs.
Now they are updating their own applications over time, but it often feels like the development team didn't really know how to use Fluent exactly. Let's just hope they will find a way to fix that in the future.
Oh, and Microsoft, for the love of god, please fix the ui of ALL parts of windows. Not just some. It's not enough to use a different button in the start menu, if the ui opening is straight out of a time capsule powered by Windows 95
The OS works reasonably well, I think it's much more reliable that Mac OS has been lately.
Personally, I don't care so much if some ancient and marginal utility that I barely touch has an ancient UIs. Say "event viewer". I mean, my OCD part may cringe, but in the grand scheme of things...it's there, it works well, it looks ugly as hell, but I wonder if someone uses it regularly (probably some company).
But other applications, such as File Explorer or Device Manager, or the partition utility, or some of the menus...yes, they need to be updated. And I think it's a matter of time.
Microsoft is slow at design, but development pace, at least design-related aspects, seems to be speeding up. All fingers crossed!
To me, Windows has ALWAYS looked gross. Windows 10, at release, was the first version that looked "tolerable". With the current Fluent flavor, including the app icon set, for the first time, things look actually "good".
If these new changes are applied consistently, I think Windows has the potential to look great, for the first time in its history. Just my personal opinion, of course. In the grand scheme of things, look is not even so important, but we are Apple users (ex, in my case). We care a lot about these things.
