It's funny seeing people flip out over minor ****. Most of the upgrades look good or are improvements, 10% or so of them are questionable - who cares, this gets tweaked and refined over time.
iOS7 had some questionable stuff, but it was a huge improvement, and over the years iOS has become kinda perfect. I'm glad we didn't listen to the iOS6 die hards who wanted to pump the brakes and revert because it was 'cartoony'.
Finder was getting to look like old crap. Menu bars were starting to look like old crap. All this stuff looks generally better.
And when I return to Mac after being on iPad for a while , MacOS icons and UI does currently look dated. I'm glad they are making it more iOS/iPadOS-like.
And it's the same EVERY TIME apple change anything - "HORRENDOUS, AWFUL, AGHAST", relax bro.