> Can't you also plausibly in a similar spirit argue for the point that the regulations about retraining pilots were responsible for the 737 MAX disaster?

I don't think that's a great argument, pilots needing to be trained/certified for a significantly different plane is a pretty sane regulation. Would you feel comfortable flying in a plane that the pilot was never trained on?

Also, I would argue that the ultimate cause of this disaster is that the Pilots were not adequately trained on how the MCAS system works. This only further supports this kind of regulation being important.