Counterpoint; trauma is so difficult to forget that the relatively small footprint of forgetting random, unessential facts just doesn't compare to the benefit of being able to forget something you would otherwise get into PTSD-style thought-loops over. Don't think about the time a close relative passed away; think about the types of torture John McCain went through. Do you think he could have come back and been the man he was if he couldn't lock some of his memories away?

And there is no "initial phase of emotional reactivity". It's a continuous spectrum of reactions and reactions to those reactions. Real trauma is like being hit by a train, or getting cancer. Yeah, you'll recover, but you'll never quite be as healthy as you were before the event even if your recovery is miraculous.