By no means do I think a locked diff is useful for ice driving. It only comes into play to avoid being stuck in a rut but once moving, only a fool leaves them engaged.
I don’t like the brake engaging traction control concepts for a vehicle that is losing control (skidding through a turn, etc). It just strikes me as a bad idea.
I understand that as an emotional reaction, but you should be reassured by the well-proven success of ABS braking. Traction control through ABS is a similar thing – about maintaining traction by allowing the wheels to rotate without overdoing it.
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