There's plenty of foods that fall out as well. No one is asking you to eat any intestines... but why common mushrooms, that are abundant, replaced by literally

There's plenty of foods that fall out as well. No one is asking you to eat any intestines... but why common mushrooms, that are abundant, replaced by literally only ONE species? Your regular store will have 5 types of mushrooms, that are all literally the same mushroom at different stages of maturity. (Agaricus bisporus is typically the ONLY fresh mushroom available at supermarkets in US)