No it is not hard to believe. I am talking about a Psychiatrist .The Psychiatrist is much more educated and does have the authority to give the medications and make propper dianosis .In my case my therapist and the pscyh. doctor work in the same place. The therapist does the talk therapy... And the Psych. doct. does the rest. This was my personal experience with my doctor and therapist.
I believe it is better to have a Psych doctor handle the letters anyway, because they are far more experienced and educated in disorders and how to treat them. The therapist i see is Licensed too, and It was handled by the Psych. Doctor.