I think it is true to say that all low-slung engines produce a pitch-up moment that increases with power, which is a desirable trait, in moderation (for one thi

I think it is true to say that all low-slung engines produce a pitch-up moment that increases with power, which is a desirable trait, in moderation (for one thing, if the power fails, pitching up would be more dangerous than pitching down.) Also, all engine nacelles produce a small amount of lift when at an angle to the incident air. It's just that the 737 MAX has become so different from the original 737 that this has finally become a problem - the bigger engines further forward were the last straw (and it is the lift, specifically, that is the problem, hence a solution that takes angle of attack as its input.)