[userbinator]

but I felt I could do almost anything in pre-OSX MacOS with the keyboard

How do you open the menus and browse through them to find and select the option you want?

[troyvit]

IIRC for the most part option-f would bring me to the file menu. I could down-arrow to scroll through it or hit the right arrow to move to the next menu. In that way I could navigate pretty well.