We need a clinical study where a group of veterans with PTSD is given MDMA and an isolated quiet place to go for several hours. Each of them is told they're receiving a drug that cures PTSD. The placebo effect paired with the brain rewiring effect of MDMA will cure more people than any other method and demonstrate that the effect is self-contained.
Basically, the MDMA subdues the negative emotions, and the talk therapy forces recollection. Without the latter, you just have a pleasant trip, but I highly doubt real progress would be made against the trauma.
Anecdotally it's very uncommon to hear about people having a bad time or even a neutral experience on MDMA in any number of settings.
Probably because there aren't any people there looking for specific boxes to check
Doing this in front of one of them is a horrible idea because it all gets documented. That's not a very relaxing environment tbh, it isn't a relationship where you are both on equal footing
And this all gets exacerbated if the therapist has their own issues that you aren't aware of