Lets be fair to Boeing. It was their customers that asked for similarity and no additional training from the 737NG. Boeing (or its subsidiaries) would have been more than happy to sell additional simulator time to cover 737 MAX differences. Adding an AOA disagree warning light to the baseline model would have required a procedure: What do we does that light mean and what do we do about it? And that means training. Even quietly handling the AOA sensor failure (with dual inputs) wouldn't work either, as changing the handling characteristics without notifying the flight crew would be unacceptable.