I call it my Warcraft-Quake era, we still used keyboard only for Doom 1/2 back in the early days

This is my main reason for not pining for the days before the mouse: it made gaming 100000x better. I remember when we first started playing quake, a lot of the guys swore by the keyboard only, until I regularly destroyed them with the mouse. . .and they all switched over.

I've also done a lot of graphic design, photo-editing, schematic design, etc. . . and can't imagine having to do that solely with the keyboard (but again, I'm often like "why isn't there a keyboard shortcut for this?").

Also, when it comes to productivity, I guess it depends on what you are doing because usually my big hurdle is not how quickly I can do actions (that is usually more important in video games, tbh), the big hurdle is sitting down and thinking about how to do it correctly.