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I had an instructor who was also an EMT for over a decade who said they considered CPR to be just a way to keep the meat fresh for organ donation. You don't get a real boost in chance of survival until you use an AED. So I would agree that the main benefit of rescue training is increased awareness of concerning situations before a problem emerges.
Kinda... An AED will only coax the heart out of an arrhythmia.