I think the snubber is more than just to stop spring wrap. As the tires rotate forward the axle housing counters and wants to rotate backwards. The axis of rotation at this point is the axle shaft. When the snubber contacts the floor board the housing can no longer rotate on the center of the axle shaft. The momentum of the housing rotation now tries to lift the car up off the ground similar to when you twist a flat blade screwdriver to seperate 2 parts. This places more force downward onto the tires.

Sounds great in theory.

But I wonder if Snubbers are like helper springs. If you put a mondo spring pack on a truck, you don't need helpers. But if you want a compromise you put a lighter spring with a helper that comes into play when loaded only.

Maybe a pinion snubber is a great way to allow for a decent ride but also keep against wrap up when the customer wants to romp on it.