I would like to point out that MCAS was only a thing because Boeing wanted to certify the 737 MAX as just another variant with no additional pilot training or certification needed. But the differences made the plane maneuver and react to input differently. So MCAS was developed to try and compensate for that. And then they didn't train pilots on the new system, because it was being certified as a regular variant that should not have different flight characteristics. The FAA accepted their explanation at face value and rubber stamped it basically, and in the process saved Boeing Billions of dollars of additional development costs.

https://en.m.wikipedia.org/wiki/Boeing_737_MAX_certification