I used to be a glider pilot (and an instructor). A disadvantage of a yolk is that when you are flying one handed and apply g (or encounter turbulence) the g for

I used to be a glider pilot (and an instructor). A disadvantage of a yolk is that when you are flying one handed and apply g (or encounter turbulence) the g forces on your arm induce roll inputs, a stick reduces that. As most powered aircraft are optimised for cruising at 1g this is not so much of a problem but with gliders varying g forces are quite common. The other consideration is that with most light powered aircraft the pilot and passenger get in from the side and a traditional stick sprouting out of the floor gets in the way, a yolk doesn't. With gilders you usually enter from above so the stick is not a problem.