Comment by microtonal

To be honest, I have used macOS since OS X 10.4 and most of it is still very similar UI-wise? Finder, Spotlight, basic window management, etc. are still pretty much the same. If you had a time machine and took someone from 2006, they would still feel pretty much at home on macOS 26. For me the only larger breaking change was when they axed Spaces in 10.7 for Mission Control (Spaces was so much better).

GNOME from 2006? Quite a different story.

I agree on lower-level stuff. Nowadays you have to partially disable SIP to use DTrace, which is meh... (and it seems largely unmaintained) Instruments is quite great though.