I wonder in what conditions this is true for. I can imagine that moving the mouse to open an app from the macOS dock is about the same speed as using the Cmd+S

I wonder in what conditions this is true for. I can imagine that moving the mouse to open an app from the macOS dock is about the same speed as using the Cmd+Space or some shortcut. I can't imagine using the mouse to go to the start/end of line is quicker than using an easy to reach keyboard shortcut to do so. I'd also wonder about differences in general computing literacy/etc. between 1989 and now. -- I'm not sure "people new to the mouse" describes a meaningful subset of professional computer users these days.