It's not the closing of the door. It's the manner of entering and the center of gravity of the body. With normal doors, when you enter the CoG is behind the foot (heel), so you don't have control over the movement of the weight. You just fall in the seat and when grabbing the handle you put too much strain on the wrist. The further backward the seat is, the worse. With the suicide doors, when entering, the CoG is in front of the foot, so you have perfect control over the weight and you just sit in the seat and you can interrupt the process if you want, while with normal doors once you have started the seating procedure you can not interrupt it, you just fall in the seat.
