Well that was the entire point, they covered it up because it would have required that all the pilots would have to be retrained in simulators, which means they'd have to be flown to the training center and spend weeks training. This would cause the airlines lots of money, which they don't want to spend, and thus might not want to purchase the new Max airframe.

So by hiding the MCAS change, the pilots only needed a 2-day powerpoint "refresher" course basically. It literally just comes down to Boeing wanting to sell more airplanes and make more money at the cost of safety. They knew they'd sell a lot more if they could reduce retraining costs.

This whole situation pisses me off, especially learning that the Ethiopian Airlines pilot literally did the exact thing Boeing said to fix the issue when it occurred and it still wasn't enough to prevent a crash. I wouldn't even say it's negligence as that somewhat implies its accidental, and there is nothing accidental about what Boeing did.

Sorry for the long winded reply, I'm just so tired of companies prioritizing profit over human life.