My suspicion, and I don't actually know this it's just an expectation, is that there'd be no performance gain on the road with something where you don't have the levels of torque such that you're breaking traction all the time by accident. If the car's being used on the track a lot, or on the dirt a lot, that's different - but I suspect that for road use, the fact you're forcing one rear tyre to lose traction on every corner would be a downside.
