[BeefWellington]

I mean, sure, but Apple at the time also had a vested interest in showing mice were better for productivity.

IME, having actually worked on replacing an old mouse-less DOS package for a company in the past, it was 100% faster for the employees to use keyboard shortcuts for everything. In fact, it was their main complaint about the new package they were trying to substitute for it -- it slowed their workflow down dramatically. Some of that was down to unfamiliarity with mice but most experienced users of a given bespoke system that need to do quick data entry can mentally map out how many tabs it is to any given field, and I'd bet even money they can get where they need on any given data entry form faster than a person using a mouse.

In this era of web based UIs though, we've lost complete use of keys that can provide specialized functionality with one button press (what the F1-12 keys were designed for). Software just isn't designed to be keyboard-first for the most part these days.