Thanks for the reminder on this one. I used these finer controls for years, then in the 3 years I used a Touch Bar Mac they somehow completely exited my brain. It will be very useful for my M1 MBA, where 5 notches of brightness is too dim but 6 notches is too bright.Old one that I never use but have in the back of my head: option-shift- volume/brightness keys for finer adjustment.
This one goes back to the classic days and still works, command click to click on background stuff without bringing it forward.
5.5 notches of brightness is the just right porridge of brightness for me it turns out.