@Soggybogdog could it be that the positive effect in family members is a result of being pleased someone is trying to help themselves rather than just relief that they’re not going to have to listen anymore?
I always ask people what their goal is (what they want, not what they want to stop doing). If they say they’re attending because others have told them to or to please others then that’s a problem and if, after a conversation it was clear it’s not their choice or their goal then I wouldn’t see them.
Often when I see clients for problems such as OCD their families are involved anyway, at a psycho-educational level, because often the family’s understandable attempts to soothe anxiety contribute to keeping it going and so there is some training for them about responding differently. So therapy with me may not offer families total respite from the client’s problems.
Therapy shouldn’t just be just another audience for repeating the same things and staying in the same tangle. I’d be frequently reviewing progress with the client and challenging them on their perspective and approach to their difficulties.
it sounds like you’re speaking from a very personal perspective? I think you’re right that it can be really difficult for loved ones to manage someone who has MH struggles. It can feel relentless and if the person is someone you love and care about it’s upsetting and impossible to have the neutral role a therapist can have. I think you are also right that there are other factors at play. It isn’t just the type of therapy or the skills and competence of the therapist (though that’s obviously very important) but also the therapeutic relationship, the collaborative understanding and much more besides.
If therapy is just an audience to repeat the same thinking, beliefs, attitudes without actually changing anything then it’s a waste of time, therapy is only working if the client can report some tangible improvements in their life over the course of sessions (not just insight). Having more helpful communication with their family might be one worthwhile improvement, it wouldn’t necessarily be a false positive.
Therapy certainly isn’t a magic bullet and it’s a minefield finding the right therapist in private practice but I’m not sure your generalisation about what’s going on in therapy sessions actually holds up.