The major difference between "VDC Off" and "Unplug the Yaw Sensor" is TCS (the really basic traction control that doesn't do as much as VDC) and ABLS (Antilock Brake Limited Slip). I think both are still active when you just turn off VDC with the button (but are dead dead dead when the yaw sensor is gone). ABLS in particular can really screw up a corner. It lightly taps individual rear brakes to try to assist the LSD with the rear wheel speed differentials. If you're trying to corner at the limit, those random brake taps can really screw with you.
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