At some point there has to be acknowledgement that the design envelope is unsound. Newly fitted engines have moved the center of thrust far away off the center

At some point there has to be acknowledgement that the design envelope is unsound. Newly fitted engines have moved the center of thrust far away off the center of mass. This creates huge torque; especially as is it often done in emergency situations: stalling avoidance advises to push thrust to the maximum. If you've practiced a bit with plane simulators (the ones where you design your planes), you know these things are uncontrollable. And us software engineers should know better: software-patching design errors sometimes just doesn't work. You can't just "polish it". Without active control you can't do it (which by law is reserved for the military casualty risk tradeoff) MCAS-patching it yet another time isn't the answer.