Why does diagnosis exist? I think that a "diagnosis talk" should exist with clients who receive one from a clinical professional. There is an obvious stigma in most cultures against people with such titles. Perhaps as a clinical community, we can subtly change the message of diagnosis from one of hindrance and abnormality to one of medical jargon and record-keeping.
I really think that a diagnosis would be better suited as a description/shorthand for some behaviors that help professionals understand the client. Rather than saying, "You are a schizophrenic," or, "You have schizophrenia," why not say, "Schizophrenia is the best name one can give your behaviors?" The former message gives a title and with it and with it an assumption of status. The latter is more of an agreement between professionals as to what behaviors a client exhibits. This should not be a label!