For me (not the op), the difference is between going to a corner of a physical device (mindless, immediate); vs having to hunt for specific position in the middle of device (more conscious, intent).

Put it differently, "one of these things is not like the other", so it makes intuitive sense -- for me :) -- for it to be in a corner and "isolated" from typing keys.

20 years ago I read in a very basic "Intro to UI" that 1-pixel in the corner of your screen is effectively the biggest button on the screen (this was for mouse and desktop monitor, of course), as you can just push your mouse there without aiming or stopping. The wisdom of being able to use motion to go to an extreme of device intuitively stuck with me ever since.