Gums
Shortly after the second 737 MAX crash, I was at an event at the Seattle Museum of Flight where I ran into some old friends from Boeing (including a test pilot) who'd been involved in the MAX. One thing they all agreed on was that they'd all assumed that MCAS would be covered in the differences training from the NG.
That it wasn't was admittedly bad, but may not have made a whole lot of difference in the long run - the Ethiopian crew certainly should have known about MCAS yet still couldn't handle it.