Don't you need both hands to steer properly?
Do you drive? I basically use only my left hand while driving. And my car is an automatic EV, so I don't have to shift. Also I'm right handed.
I dunno. It's just comfortable. It might be a remnant from when I used to drive manual shift, when I had to shift gears often, driving in the city. You definitely don't need two hands to steer, though. And her stump could definitely do shifting no problem.