You are so wrong in this statement. I understand the vehicles systems and know when it is helpful and when it is limiting. When you are going through deep snow and your tire's lugs start filling up with snow, it will turn them into almost slicks. The spinning of the tires will help clean out the lugs which will in turn give you some traction to keep the truck moving. Plus you want as much momentum behind you as possible. I don't want the vehicle to slow down and start searching for traction when I know it will hurt me. If my truck slows down and stops looking for what it thinks is traction, I may not be able to get going again. If you want I will go out in my snow filled Wisconsin woods and show you what I am talking about.
Again, I am not saying the system is junk, it works really well on the "road snow" or in moderate snow but in the DEEP stuff I will take my chances without it from my own experiences. It was trial and error but I have learned what works well in my area and on the different terrain.
You don't want to clear the snow out of the tread. That's NOT what gives you traction. You need to read up on what makes tires grip the snow. Here's a hint: snow in the tires tread helps grip snow.
Spinning tires rarely does any good. I'd much rather have ATRAC transferring torque in an attempt to find available traction than to just have the tires all spinning aimlessly. But don't listen to me, I've only lived in the snow belt my entire life.