>At idle power the motor should probably only be engaged when also braking. a cars' stability is aided by engine braking; if that isn't there it must be accomm

>At idle power the motor should probably only be engaged when also braking. a cars' stability is aided by engine braking; if that isn't there it must be accommodated by knowledge of such a fact by the ABS/TCS/VCS systems, or a skilled driver that is expecting it. A regular car that expects engine braking, thrown into neutral and coasting down the highway is a more fragile handling and car-dynamics situation without these precautions. The Mercedes Glide Mode accommodates this by using the ABS/TCS systems to keep the weight where it needs to be regardless of applied engine torque one way or another; the driver does not experience a differently handling car.