We have a similar situation in Spain with paella, people argue endlessly about what a "real paella" should or should not have, to the point that some people joke that "real paella" can't possibly exist, only "rice with things" xD

Myself, I am not from Valencia, actually my home town is on the opposite side of the country, so I don't care so much what you put on it as long as you follow a few basic principles and don't commit the great heresy of using chorizo xD