> I think Windows 95/2000 and the contemporary MacOS (including the then future MacOS X) have the best UI in everything I used in my 30+ years of tech life.

Agreed. I do wonder how much of it is personal, in that that UI hit at a certain formative time in my life. But ever since then it's been the benchmark that I evaluate all other UIs by. The lack of a "classic" mode in Win10 was one thing that motivated me to switch fully to Linux. To make the switch, I spent a good amount of time trawling the themes to find one that mimicks the look of Win95/95/2000. (The one I use is a KDE theme called "Reactionary".)