Juggling two with the non-dominant hand is so hard. Much harder than juggling three balls. There's something fundamentally different about using your non-dominant hand independently as opposed to in coordination with your dominant hand. I can use my left for many things: juggling, typing, playing guitar etc., but as soon as I try to do it with my right hand behind my back I feel incredibly weak.

It would be so useful to have two right hands. I'm curious whether you think getting over the hump helps with ambidexterity in general.