I hear you. Up until Windows 7, I enjoyed the "Windows Classic" theme, because I think the Windows 2000, while dated-looking, was also the cleanest and most function UI skin Microsoft ever made. Everything since then has been some degree or other of ugly, with Windows 8 and 10 being the worst-looking versions of Windows since Windows 2, which mostly suffered from the lack of hardware capabilties (low resolution, low color depth).
It seems that everything that was meticulously studied and developed back in the 80s by people like IBM and Microsoft themselves (like CUA), has been thrown out of the window with no guiding principles replacing them other than what a bunch of pajama boys with art degrees and no real-world experience think looks good. This has been going on for almost 20 years (the quality of UI started to decline in the late 90s when everyone went way overboard with skeuomorphic design and you could no longer tell what was a control and what was background ornamentation. Windows 8 went for some kind of minimalist look where large swaths of blank space on the screen seemed to be the guiding principle, not unlike 90s grunge music, which cast off all the excesses of 80s pop, with the over-reliance of synthesizers and excessive production, but along with the grunge movement, MS also threw out the baby with the bathwater, and forgot to make what was left good.
So now we have the Gnome mentality where choice is bad for you because apparently all users are stupid, as opposed to the truth, which is that a lot of users are inexperienced and unsophisticated, but plenty of users can and want to control as much as they can. For instance, I tried the OneDrive app for Android and like Windows, it doesn't show file extensions by default, which I think is the stupidest usability mistake MS ever made, except in the case of the Android app, there's no way to turn it on, so I'm reduced to deciphering icons to figure out what the hell kind of file I'm looking at. The application intentionally cripples the user by removing important information.
And don't get me started on Amazon, who are much, much worse than MS. MS may have forgotten how to make a good UI, but Amazon never knew in the first place, and it shows in their software UI. (I'm referring to their software... their website isn't bad, IMO).