Having completed training relatively recently I have no doubt that (good) operators are having to polish newbies a lot before letting them loose. I think the training is too much a tick box exercise, possibly since we have moved to a competency based system?
I remember when I did my first diversion (due to a wheels up at destination). It all worked out and wasn't a big deal but I remember clearly thinking at the end of the day "Holy crap that unfolded nothing like the diversions we practiced every flight during training". I was discussing it with a friend who had gone down the instructing route and we decided it wouldn't be hard to make the diversion scenarios more realistic... but it would take more effort from the instructor.