You keep calling it diagnosis by checklist. It's not that simple. They use diagnostic criteria from the DSM-IV, but in my experience, psychiatrists in general also spend plenty of time trying to rule out other possible causes of the patient's symptoms. Remember that psychiatrists are MDs. They know the body as a whole and have been through the same rigorous medical school training other MDs have. They simply have a specialty that relies heavily on subjective symptoms as reported by their patients, without the benefit of a battery of laboratory tests or technologically sophisticated equipment like MRI machines.
I think competent ones exercising ordinary care take a full history from their new patients. I think it is you who is being flip by dismissing their diagnostic process as being able to render an opinion that a given patient suffers from a chronic illness from a single one hour visit. I think it more often takes multiple visits and some treatment and feedback before such a diagnosis can be made confidently. Even then, the patient has to return at regular intervals for monitoring, and in my experience the doctor is usually asking questions and getting feedback and constantly reassessing the situation. I think that's all they can do at the moment.
AS
I agree with you about the "competent ones". But, I think a substantial number of psychiatrists (perhaps even the vast majority) are not "constantly reassessing" whether patients were incorrectly diagnosed with a chronic mental illness that entails a lifetime of pharmaceutical treatment. And I think protocols for such reassessment, propagated as norms for professional conduct, would be of great benefit to the more authority dependent patients, who won't simply quit the pharmaceutical treatment on their own when they sense that it's not necessary.
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