Most schools of psychotherapy are equally effective, with the very notable exception of CBT for anxiety disorders. For most patients, the school of psychotherapy only matters insofar as they buy into it - nearly all of the therapeutic benefit is totally independent of the particular methodology or even the training and experience of the therapist. Even therapeutic approaches specifically designed to be pure placebo turn out to be just as effective as everything else. If IFS or Freudian psychoanalysis are metaphors for how we think, then they just aren't useful metaphors.

https://en.wikipedia.org/wiki/Dodo_bird_verdict

https://psychiatryonline.org/doi/10.1176/appi.psychotherapy....