Most of the time preforming an athletic movement with external resistance fucks up the motor pattern.
I think the torsos key role is in the prevention of rotation as opposed to dynamic movement. With this opinion i feel its appropriate to add in some plank variations and some other stuff to a program which train this aspect.
If im wrong these movements are still pretty useful for teaching correct spinal positioning which is neccessay for squating and deadlifting anyhow. But i dont think i am.
i have heard that it fucks with the motor pattern, but if it is done at the same speed would'nt be the same kinda?