I'm thinking of going back. I can't stand the horrific "flat" UI and the crappy white-on-grey-on-light-grey, I hate not having separate window title bars, the combined title/tool bars, the inscrutable buttons labeled with nothing but a squiggle, it's just hideous now.
Even though Mojave and Catalina still carry scars from the crimes committed in Yosemite towards good adherence to the HIG, they're miles better.
> inscrutable buttons labeled with nothing but a squiggle
Something you learn to really like on Windows is how well "described" most of the UI is on hover.
In macOS even for seasoned users there are always some things you are never quite sure do and you have to Google much of it. Plenty of the UI is not discoverable, Windows got that part way better.
Even though Mojave and Catalina still carry scars from the crimes committed in Yosemite towards good adherence to the HIG, they're miles better.