In the 80s, when the mouse was just becoming common, there was a study comparing programming using a mouse vs. just a keyboard. Programmers thought they were faster using a keyboard, but they were actually faster using a mouse.
That's the Ask Tog "study"[1]. It wasn't programmers, just regular users. The problem is he just says it, and of course Apple at the time of the Macintosh's development would have a strong motivation to prove mousing superior to keyboarding to skeptical users. Additionally, the experience level of the users was never specified.
This suprises me because at the time user interfaces were optimised for keyboard - the only input device most people had. Also screen resolutions were lower so there were fewer things you could click on anyway.
logicprog|2 months ago
[1]: https://www.asktog.com/TOI/toi06KeyboardVMouse1.html
harvey9|2 months ago