> "the plane is safe to fly with additional training, when given"

If that is ultimately the conclusion, then it still gives the FAA and EASA a black eye, since they allowed the aircraft update without additional training for MCAS.

Best case scenario for Boeing is that the Ethiopian Airlines crash turns out to be something else. If it is MCAS related Boeing, the FAA, and EASA amongst others that green-lit the update without training have a lot to answer for.