Not all of medicine is dealing with the full complexity of the human body. A lot of it is applying wrote knowledge to essentially follow a flow-chart to map a set of symptoms and details about the patient to a diagnostic / treatment plan. Doctors are trained to not deviate from medical orthodoxy, and for instance it's been studied that if doctors are told another doctor has already come to a given conclusion about a diagnosis, there is a strong effect that they will confirm the diagnosis even in the face of contravening evidence.

I.e. I don't need "Dr House" to tell me to take 2 and call him in the morning. There is a whole large swath of routine medicine which AI could probably do.

And I am happy if you and your family have been lucky to be blessed with good health and good care, but many people have experienced having a mysterious medical condition, and going to several doctors or waiting months before it can be properly diagnosed. Human medicine is far from perfect.