Nobody does that in a "live aircraft", that's what simulators are for (and the whole flight training curriculum, from the first lesson to being able to fly a commercial jet).
Then we read that the MAX was the "best selling model." It seems, based on the false advertising, that included not acknowledging the differences. Even the "less serious" ones:
https://news.ycombinator.com/item?id=19374386
"I had my first flight on the Max [to] ZZZ1. We found out we were scheduled to fly the aircraft on the way to the airport in the limo. We had a little time [to] review the essentials in the car. Otherwise we would have walked onto the plane cold. My post flight evaluation is that we lacked the knowledge to operate the aircraft in all weather and aircraft states safely.
The instrumentation is completely different - My scan was degraded, slow and labored having had no experience w/ the new ND (Navigation Display) and ADI (Attitude Director Indicator) presentations/format or functions (manipulation between the screens and systems pages were not provided in training materials. If they were, I had no recollection of that material)."
It just looks like they didn't even get proper simulator training in too many cases.