One can point the finger at Southwest in more ways than one. An airline of that size should have an adequate technical team, maybe they felt they can leave all that sort of thing to Boeing, diverting their pay to executive bonuses, but they should surely have their own people, who say "what's everything different about the Max", and when they come across MCAS (which at least, even if concealed from pilots, must be mentioned in passing in the maintenance manuals and in the programming logic for the sim), say "how does this work then ?", at the programming level. And then "Isn't this liable to a single point of failure ?". Because if every armchair commentator it seems can see what was wrong with the design, shouldn't an airline the size of Southwest have someone who could have done the same ?