Admittedly, the goal is to have a level of realism but in many situations, the real environment in which the performance needs to take place is not all that exciting or motivational and doesn't have a direct impact on the person's performance in that environment.
So adding those parts into a simulation is not always a good idea. A simulation is designed to capture the essense of what needs to be learned, it is a model of a situation or a behavior and not a play-by-play realistic re-telling of what happens in a particular situation.
I think this video from The Onion underscores the problem:
Ultra-Realistic Modern Warfare Game Features Awaiting Orders, Repairing Trucks
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