Reacting to the headline, I understand the basic concept of medicine is you treat a patient who presents with a condition, not a condition in isolation like some kind of abstract math problem. I think it's a mistake when doctors say to each other, even as a shorthand, I have a gallbladder to deal with, when it's a real person, and the best results come from considering the whole person when pondering how to care for them and which treatments to administer, with the medicine being only a part.
You are speaking commendably from the point of view of diagnostics but from the point of view of physical operation you absolutely need that specialisation.
It is perfectly reasonable for the doctor to have "a gallbladder" to deal with--there are few failure modes and a standardized response to them. In specialized fields you will find professionals describe situations in terms of a baseline and any deviations from said baseline--just about completely unintelligible to anyone who doesn't know those baselines. To describe a patient as "a gallbladder" is saying it's a standard presentation of the problem. And doctors are not supposed to identify patients if not necessary.
