Re: MCAS is being misportrayed
The rule of three is broken - so is the rule of two. The 737 has two Flight Computers (FCs), these each have their own AOA sensor - there are no links between the two. In flight, only one FC, and therefore only one AOA is used. The standard operating procedure is to alternate FCs between flights. So it's worse than you thought - only one AOA is used during flight and if that one is buggered, so are you.
Great design Boeing!