"...cut power to the stabiliser trim motor..."
Geezuz H.
The design and procedures should allow cutting off the MCAS while maintaining power to the manual trim switches. As well as providing also providing another kill switch to cut power to the trim motor. i.e both, individually.
One would have to be a half-wit to design a system where the first step also disabled the trim switches and motor.
Biting the hand that feeds IT
