Furthermore, it seems that the MCAS acts by moving the entire horizontal stabiliser... whereas the yoke moves the elevators only. This means the MCAS will alway

Furthermore, it seems that the MCAS acts by moving the entire horizontal stabiliser... whereas the yoke moves the elevators only. This means the MCAS will always "win" in a metaphorical tug-of-war between the two controls. However, the incident of B737 diving into the ground has been observed before, eg: https://en.wikipedia.org/wiki/Flydubai_Flight_981 https://en.wikipedia.org/wiki/Flydubai_Flight_981 and https://en.wikipedia.org/wiki/Tatarstan_Airlines_Flight_363 https://en.wikipedia.org/wiki/Tatarstan_Airlines_Flight_363 , on aircraft not equipped with MCAS. In those cases a possibility of a mechanical malfunction of elevator controls has been raised (but not confirmed) as a possible cause of the crashes.