I don't have a Mac, but there's a lot of keys I never use.
I pretty much never use function keys for anything but setting volume and brightness, I fairly rarely use alt, escape isn't that common.
I use the arrow keys just enough that I'd be annoyed without them but definitely not all the time.
I could probably be fine with just ctrl, shift, enter, and the printing chars, with several weeks of work to learn some alternative to pgup/down/end/home, but I really like having those as single keys.
I don't use a MacBook, so perhaps this isn't of interest to you. I've never measured my keyboard use, but based on the wear on the keycaps, here are the keys I use the most: space bar; all letters except Q, P, Z, and X; backspace; and cursor keys.
I use caps lock a ton because I’ve used the stock Mac setting to rebind it to escape.
Capslock -> Control (via System Preferences -> Keyboard -> Modifier Keys).
Out of curiosity how did you measure this?
Good question.
F6 half moon key is to enable disable focus, handy if you have ADHD no doubt.
https://discussions.apple.com/thread/255111106?sortBy=best