Just so we are talking about the same thing...
Friction drive uses 2 surfaces in physical contact under pressure, to transfer torque from one surface to the other.
Traction drive, uses a special synthetic oil between 2 surfaces that are NOT in physical contact, to transfer torque from one surface to the other. The "gap" between the surfaces is precisely controlled (through high quality manufacture), and the fluid used has a property where it becomes virtually solid when exposed to significant sheer pressure. So it's actually the fluid that transfers the torque in traction drive, NOT friction.
Traction drive therefore does not require the bearing loads that friction drive does. Traction drive however always involves a small amount of slippage, because the fluid cannot demonstrate the solid property, until there is a certain amount of sheer pressure.