I understand you love your animals but your anthropomorphism of them is not good for them. Ball pythons are solitary and realistically very basically minded animals. This is not an "opinion". They do not "want" to be near each other. Housing together also creates a battle for dominance for the best spots. These are not loving, happy to see you, miss you when you're gone animals. Those would be dogs and other furry friends. It is what is with snakes.
Also, unless this vet has some serious experience and credentials dealing with herps, especially snakes, I would not take their word over the vast amount of experienced keepers on this Forums. There have been plenty of people who have been told wrong information by vets. It is tough to find a qualified herp vet.
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