Because it is intrinsically human to act on impulse when overloaded.
And thus there is value in SIM scenarios where the trainees get served more than they can handle, although careful guidance of the instructor is needed to stay on the beneficial side.
Given the choice in a possible real-life complex engine fail event, as a pax I'd rather sit behind a jockey whose hand had slipped in the forming years compared to a virgin.
This is simply the root of what so many modern accidents are made of.
Modern accidents are made of the same old good stuff that has always worked: Complacency, incompetence and fatigue. Far easier to sort with fresh colleagues, as opposed to experienced bums if their motivation got eroded through various perils of life.