Based on my understanding of the research on health interventions and outcomes, odds are high that improved or normalized quality of life while in long term therapy is a case of regression to the mean. Could also be due to simple intangibles like feeling less lonely or more supported.

What's seemingly least likely are the convoluted or nonsensical narratives that therapists favor (e.g. the client's "infantile transference neurosis" was successfully treated). I guess this justifies the high fees and makes therapists feel special (which seem to be the twin aims of the system).

Also, seems many people who report long term benefit are still in therapy. What happens after termination, which seems to destroy some people? Or if termination never comes, does that mean "working thru" transference is a process without end?