But there lies part of the problem, the crew of the BMA crash on the M1 had been trained on the -300, a quickie two day conversion to the -400, and whilst what happened thereafter may be history the flight crew subsequently won an industrial tribunal or two on the grounds that they hadn't been sufficiently trained to operate the -400.
This was what sprang to my mind VERY quickly after the Max was grounded. The lesson was learned in 1988 that an OHP presentation in class wasn't sufficient to nail home some of the gotchas in the new aeroplane, and a lot of people died or had life changing injuries as a result.
I was disappointed this happened again!