Even if physicians wanted to try to learn/practice/apply across different fields, there is also tremendous push-back from other specialists, and anyone who tries is mocked. In retrospect, the cabal trained docs this way so that one could never understand the full spectrum of illness and treatment because the docs are all walled off from each other.
After the first two years of medical school, all the training then becomes uber-specific to whatever field the med student wants to study. Yet another example of keeping us divided. The fault was built into the system. Thoughts?
Check out Dr. Glaucomflecken. He does these bits about multidisciplinary rivalry. As is true for all humor, what makes it funny is the truth of the joke.