

There are many pros and cons. They are different things. While the main reason is that commercial solutions are selected to be as accessible as possible while piracy solutions require the user to make a lot more decisions (many of which can be made wrong), there area also valid reasons that spring directly from being different mediums. It is not hard to discover these reasons by simply trying it for a week.
Grain lasts years. Starchy tubers (which we are uniquely evolved to consume and what was actually what supported the energy requirements of our large brain in pre-technological times) last all winter, or longer if you don’t dig them up. Salt preserves for years. So does pickling. Hell, even dogs are smart enough to preserve food by burying it in an anaerobic environment. A whole lot has to go wrong for the milk from an animal to be the margin by which a person survives, and by that point the animal has probably already been slaughtered. Exceptions like African bushmen who consume blood as a primary staple are quite rare.