Some would say it’s “the market” who determines what ends up in cookbooks. For example, editors will say that people will want, for example (a real one), a story about clay pots in Vietnamese cooking, because when they go to the restaurant, they always see on the menu clay pot catfish or tofu or whatever dish.
You will try to explain to the editor that NO ONE in Vietnam or no Vietnamese immigrants use clay pots. It was used during times of war and poverty, when the military needed metal or when a person can’t afford modern cookware. But the editor will say: well, we already shot the photo, and the food stylist used a really beautiful clay pot, and so…please write a few paragraphs about this “traditional” method of cooking.