However, we are all creatures of habit,
If the PIC was not totally on top of new input requirements under certain conditions, the way he has done things for years flying similar, but different models, could cause issues handled by some, but not all who operate them.
These days, everything gets more complicated, but in most things "simplicity is the essence of reliability"
The Air France A330 issue with pitot's problem was fairly quickly overcome, and the skies are now full of them operating safely.
Hopefully they get the 737-800 Max sorted quickly too. It would be devastating for a company like Boeing's reputation.