Thanks for engaging. I'm afraid you may have missed the main point, which is that having a simple, universal model can simplify practice, training, and, ultimately, research on how best to foster change. That being said, your point about breakdown of previously learned skills is a valid concept that goes back to Freud. When that happens, people do fall back on responses that are more primitive and instinctive. These are often looked at as failures of coping. They do represent failures, but they are also regressions to some earlier and less effective response. Thus, these breakdowns can be seen as the reappearance of an entrenched maladaptive pattern.