Many years ago, our 16 year old son was taking flying lessons.
He had a part time job and paid for the lessons himself so I tried not to interfere.
One day he came home and told me about how he learned to bank the aircraft by opening one of the doors.
I think the instructor was in his 30s.
Son did finish the lessons and got his license.
Banking of a small aircraft by opening one door is a great way to gain a better real-world understanding of aerodynamics and a/c performance. It could serve a valuable function if in some future scenario, in an aircraft with a snapped aileron cable, making the difference between getting down effectively and safely on something flat, as opposed to smacking into a tree or building.