They underestimated the aerodynamic instability and then decided just to give this auxiliary system total control. What possibly could go wrong? They should hav

They underestimated the aerodynamic instability and then decided just to give this auxiliary system total control. What possibly could go wrong? They should have gone back to the drawing board, putting of the launch and figuring out how to lift the airplane a bit higher. May have required them to lower the 737 prices for a while to stay competitive against the 320neo and may have cost them a fortune. Feedback loops with high gain (strong engine pulling up, powerful MCAS pushing down) are difficult to control. Minor failures have out-sized impact. Adding rules to constrain the system introduces new operating modes all of them having the potential to confuse the pilots. And in this system the pilots are close to ground and have very little time to act.