I don't particularly care about the GUI...

most of my time on my Mac is browser (Chrome), terminal, and Electron apps. Even my IDE is just Electron.

The new Finder and menus look ugly, but frankly, in the age of Electron everything, the OS UX doesn't matter that much, as every app has its own one, reimplemented in JavaScript and React.

Slack still looks like Slack in Big Sur, in Catalina, in Windows 10.