But it has regressed so far from where it was 25 (or more) years ago that every day I'm still infuriated and depressed that I've had to return to it for work. The idiotic UI blunders alone must waste hours of my life per week.

Aside from the absolutely baffling functionality removals, there are the hateful petty ones. Great example: the removal of Remote Desktop. I erred in getting my parents Windows laptops, thinking they'd benefit from the familiarity. NOPE. And when they encounter some defective bullshit that stops them from doing what they're trying to do, they call me for help but I can't log in from 2400 miles away because MICROSOFT REMOVED THAT ABILITY. Disgraceful.