I'm a bit mind boggled there is even a human involved here. Lab results + Patient data = Diagnosis + Prescription Why is there a Physician deciding if medicin

I'm a bit mind boggled there is even a human involved here. Lab results + Patient data = Diagnosis + Prescription Why is there a Physician deciding if medicine is needed? The patient data from the original visit + lab should be enough, not sure why a second visit is needed. (This is only a problem because Physicians make somewhere between $250-$500/hr, if we had a market drive supply of Physicians, I don't think this question would be important)