Yea, I was referring to the way that the CVT works, strictly on friction between the belt and the rollers, which seems pretty precarious. With a conventional manual gearbox, the gears are in constant mesh with the teeth. If that type of gearbox starts to slip, you have done something very very wrong to it haha. Even with a conventional automatic gearbox, the clutches are made out of high friction clutch material and there is good amount of surface area to grip onto.
Not trying to give you a hard time.... I mean this honestly and sincerely.
But CVTs work by coefficient of traction.
Not friction.
The oils in the CVT transmission uses the coefficient of traction to help the belt to grab and hold properly.