I think I could trim my own hair with a third arm. I just need the hand mirror in exactly the right place. Can’t make it work with just a mirror-on-a-scissor-arm.
I could write or shuffle papers (like wrong 5-page phone bills) when I’m on the phone without getting a crimp in my neck.
I could manage to get the boiling-over pot off the stove while I’m stopping the mess from spreading. Somehow I can’t manage both with a full pot.
I could get that back zipper unstuck. Needs each side held plus the slider.