This is a mischaracterization. The problem was everything was being squeezed simultaneously. There are lots of ways to make a 737 that's safe with new engines

This is a mischaracterization. The problem was everything was being squeezed simultaneously. There are lots of ways to make a 737 that's safe with new engines. A combination of schedule, desire to avoid transition training, and desire to avoid signifiant systems changes made it hard to do that though. The critical moment was in flight testing when a pitch instability was discovered at low speed and low angle of bank. MCAS originally was a hack, but would have been safe, using a G sensor and AoA to activate. The new low speed instability didn't trigger the G sensor, and needed a bigger trim correction, so they either had to redesign the augmentation system, or make MCAS much less reliable and more dangerous. They chose to ship and meet their deadline.