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Except that a large portion of the force required to rotate a midengined car is already present from the inertia of the car. For example, if the engine is in the front, and the car is moving forward, the engine will want to continue to move forward. So rotating is actually being fought by this inertia. One of the major components in understeer.
On the other hand, in a car with the engine in the back, the engine also wants to move forward under inertia. And as long as the car is perfectly straight to the direction of travel, that inertia just propels the car. But when you start to turn, that engine will still want to keep moving forward, which is now at a rotation point from the direction of travel.
So there is a major difference in the physics. The front engined car will want the front to continue straight. Not spinning. Just plowing. A rear engined car will want the engine to continue straight, which means the back end is coming around.
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