So many, many rants could come from this and my blood is boiling in fervent agreement. But two thoughts: as hard as it is to use the contrast-less, contextless obscure icons and "is it checked or toggled or active", try working with someone and having to explain "click that thing, I don't know what it is, no, the other one, to the left, arghghhg."
But really, maybe these aren't our interfaces anymore - the lack of scrollbars on macOS is because of the touch, pinch and swipe touch interfaces, and the people that are now very happily consuming content (and creating, although less so) without having to worry about that extra bit of information. But the rest of us suffer, and the "increase contrast" and "reduce motion" checkboxes don't do nearly enough to reconfigure the UI.
I never really appreciated the Mac modding community[1] (kaleidoscope?) and the powerful frameworks they had to build UIs, 90% of which I'd happily switch to today if I could.