[asteli]

I agree re: power. I do not agree about traction.

Assume you're stuck in mud somehow, a perfect case for diff lockers. If you lock the rotational rate of all your wheels together you are either:

a.) limiting the torque you're applying to the amount the tire with the least amount of traction available can bear before slipping out, or

b.) letting 'em rip and hoping you don't dig yourself down into a hole.

The beauty of having fine control over the power going to each motor is that you can put down the max torque that particular wheel can manage regardless of what the other tires are doing. And you can do so with a granularity that is unmatched by any ICE TC system (which IIRC use the brakes to control torque?)