If instead of specialized doctors (neurologists, cardiologists, gastroenterologists, etc.) we had doctors who each knew the same things about all aspects of medicine it would be:

The correct answer would be "it would be the worse situation as the total medical knowledge would decrease in a society".

If all the doctors would have the same level of knowledge about all aspects of medicine then it might be possible that none would be able to treat a particular disease as all would have limited knowledge about that disease.

In contrast, specialized doctors or surgeons have maximum knowledge about a particular organ which helps us in treating the disease efficiently.  

For example, the cardiologist would have much more knowledge about the heart as compared to the general physician.

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