Going with your theory, I'd say that pointing devices are more precise which means they require more brain-CPU cycles to operate ... pixel-space is large and yo

Going with your theory, I'd say that pointing devices are more precise which means they require more brain-CPU cycles to operate ... pixel-space is large and you must position it within some delta of the target widget you're trying to use. Whereas in emacs, say, it's a quick "C-x o" to change to the next/other buffer.