Don's take is correct. One of the things that I believe ISS was doing right was stressing that, though you may fail to achieve the objective during a training scenario, you are still better off than you were without attempting the training. Personally, I find that failing
a scenario can often be more beneficial than successfully completing one.
In training, we should be trying to achieve perfect execution of our plans to achieve the objective. If we take a few shortcuts and the objective is still achieved (or we just get lucky), everyone smiles and high-fives are exchanged, but did we really advance ourselves? For the past 8 months or so, I've been experimenting with running video during training. Being able to play back an entry drill, for example, has been very eye-opening. Similarly, recording range time can be very valuable. You shoot isoceles, huh? Gee, it sure looks like your weak arm bends right after you start shooting
Rather than explain the concept theoretically, ISS tried to PT the concept into our bodies. The rationale? If we didn't learn, we'd at least be stronger from the push-ups, etc!