I think the approach generally should consider the individual patient and what is helpful and best for them. I think that someone should work on the ideas of psychology to begin with - not disclosing, not touching, until they understand the patient's history and current psychology.
I don't necessarily think the disciplines are so separate.
I've never had a social worker, but I have had psychotherapists who didn't touch me or tell me anything about themselves. And that worked fine for me.
I've also had a psychologist who did occasionally touch me and offered to hug me (my choice) and did sometimes tell me things about her, and that worked for me as well.
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