What if PTSD therapy focusses on accepting things you can't control and sitting with the pain? That's how I work through anxiety, and depression. I know it will never be gone, I don't try and set expectations to live without anxiety, I just try and sit with it, and accept it.
Much of mental trauma is about acknowledging it, and learning to live with it. There is no cure for PTSD, even Ketamine is short acting, not a long term solution, and indeed Ketamine simply helps you sit with the suffering in a different light.
But there are treatments. Last I read exposure therapy and EMDR were the two main ones. I don't think I'd be a big fan of exposure until the reactions have been significantly reduced, but everyone is different. EMDR didn't do much for me, but Internal Family Systems did. CBT is also great for some people.
Is it your take that every person in therapy for PTSD so wasting their time?