The 'upside' to trauma is definitely a silver lining sort of thing., There are ways in which people accustomed to the trauma experience can function in ways that seem impossible to a non-PTS survivor. Like when things are absolutely chaotic and it actually feels normal, the ability to be clear headed in other kinds of trauma situations, the ability to visualize more clearly and vividly (both as a recall mechanism for our wound trauma as well as a method to visualize a different, happier reality as we learn to put the PTSD gremlins aside.
My martial arts teacher once put it something like this: When you push past where you think your limits are, you often discover those limits are further out than you think they are. There is a martial arts training concept called 'shugyo' - intense physical conditioning designed to wear out the body and mind, the idea being that if you ever have to use your martial arts to defend yourself, it's not going to always be when you're rested, ready, and on an even-keel. Learning how to overcome intense stress and trauma is as useful to the karateka as it is to the PTS/PTSD sufferer. In the case of a martial artist, though, they undergo that voluntarily, with the intent of strengthening themselves and with the guidance (usually) of an experienced teacher who knows how to cultivate that. Being pushed involuntarily through that experience via trauma makes that experience more fraught with psychological peril, makes it more a roll of the dice. Some of us roll a 6 and come out stronger. Others roll a 1 and are permanently broken. To re-traumatize PTSD sufferers before the original traumas have been dealt with is almost a sure-fire recipe for disaster, IMHO. A few people might transcend in that fashion, but that seems a longshot at best.
There's things I can do mentally and emotionally that most other people can't, quite bluntly, because they've never had to. It simply wouldn't occur to them to try were they not put into an extended trauma situation like I was. In some ways those things are a point of pride for me in having overcome that pain, confusion, and anguish. But it's nothing I would ever wish for someone else, not my best friend, not my worst enemy.