On the Windows side, Windows 2000 and XP/Vista/7’s Classic mode, though Aero was quite nice. I’m not a fan of the interfaces from 8 onward, and I didn’t like Luna in XP.

On the Mac side, it’s a toss up between the platinum interface of Mac OS 8/9 and Mac OS X Tiger. With that said, I have a work-issued MacBook Pro running Golden Gate as my daily driver, and Liquid Glass is alright. It’s not what I’d prefer if I had a choice, but it’s not a dramatic departure from previous versions of macOS. A Cheetah or Puma Mac OS X user should be able to navigate Golden Gate with ease, mostly.