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The Hummer EV has a locking front diff and a “virtual” rear locker (but only three motors). But yes, open diffs with brake control is a functionally adequate if not exceptional system for all wheel drive.

I'm not an expert by any means, but from reading into differential design an open differential always sends equal torque to both sides. In worst case limited traction conditions like if one tire is in the air, half of the applied motor torque will be wasted in the brakes (the other half moves...