I don't know if anyone I know that understands the "circle of traction" concept of this video. It is so much more important than just snow traction. If it was taught in school, nobody would ever crash!
No matter what the conditions, a tire can only have maximum traction in one direction only. That's why when hard on the brakes, you can't turn, and when hard on the throttle it does the same thing, except you have no idea which way the car is going to turn. You MUST stay inside the circle, and when you're not, you have lost control of your vehicle.