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Originally Posted by B&DCalgary
You have a slight misperception about traction ... Slowing the rotation of the tire to prevent spinning actually maintains traction, and a non skidding tire will always provide better traction and better acceleration than a spinning tire ...
The only time spinning the tire might be an advantage is if the snow is so deep and soft that you can't get traction, then spinning the tires can sometimes burn down through the snow to the point where it hits pavement.
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No mis-perception here - that's an example of a situation I had in mind... seen it happen several times. I've also (in my snow-tired 328Ci) had TC actually slow the vehicle to a stop when climbing an icy hill b/c the wheels could not find enough traction to keep them from spinning. After switching off DSC/DTC, from a dead stop, I was able to scoot right up and over the hill by keeping the wheels carefully and slowly spinning (like 2-3K RPM).
I'm aware of the physics of traction as well, but I've found that sometimes the real world deviates from academic theory.