They did not stall because of the engines. The plane would be perfectly flyable without mcas, the plane only behaves differently. But in order to avoid recertif

They did not stall because of the engines. The plane would be perfectly flyable without mcas, the plane only behaves differently. But in order to avoid recertification boeing decided to tweak the plane behaviour with mcas so that there is no noticeable difference for the pilots. In hindsight this obviously wasn't done right.