You would think so. And yes, using a wind crank can be pretty violent.
But while you notice, feel when something is not going right, the motor just plods on. Consistently, yes.
And while your hand comes to a sudden stop when something blocks, the motor keeps on going. Consistently.
And it has some power... It can jam gears, break cogs, kick backs off the camera. It will not stop until it, or something else breaks. (Don't ask me how i know...
)
I also think a motor is not gentle in the way it starts and stops either. Less gradual than your enthusiastic wind arm/hand.
Anyway, the EL(...)s too are build to last, and at the current prices are a good buy.
But get a good one...
P.S.
All Hasselblad backs work on EL(...)s. Hasselblad Polaroid backs are in good supply, and cheap. So no need to get another one.
The only other third party backs are digital... (of which most - if not all - will indeed fit).
What backs did you have in mind?