Great points on being raised by more adults, rites of passage, and the context in which combat PTSD occurred. I don't disagree - these were definitely (sometimes powerfully) mediating factors.

And yes, it's an open question as to the degree of suppression of PTSD and natural traumatic resolution in pre-industrial societies.

I do also agree that there has been a deep phenomenological understanding of trauma for many, many generations of humanity. It most likely wasn't called "trauma" (until perhaps recently).

I also believe that our current understanding of this phenomenon has reached a level of sophistication that we've never had before, and this is bolstered by various advances in culture, science, and policy. For example, the legal use of entheogens as a medically prescribed treatment for PTSD (of course, these could be used to treat PTSD hundreds of years ago, and there were and are beautiful traditions around this -- the models were just different, though).

We may have been less trauma-naive and less trauma-generating at some point in our collective history; I wonder about the level of holism of the models of trauma at that time.