It's not enough that the windows are getting bulky. The thickness of the frames is _inconsistent_. Look at the screenshots
- Some of the windows look like they look now (Safari, Maps, ...) [1]
- Settings are skinnier [2]
- Finder is bulkier [2]
I might be a bit autistic in this hurts my eyes.
[1] https://www.apple.com/newsroom/2020/06/apple-introduces-maco...
[2] https://developer.apple.com/design/human-interface-guideline...