A training mistake no other pilot would ever make, even in a simulator? Surely the whole point of putting a pilot under training in a simulator is because they will make mistakes, they're expected to make mistakes, learning from mistakes is a part of learning, and they're doing it in a simulator because they need to learn.
If we have a supply of pilots who don't make mistakes as they learn, why do we bother training them at all? Surely we can put these magic trainees straight into the cockpit.