And it's woeful that so many people are completely clueless about how to make their own food. So they outsource it to companies that don't always have their best interest in mind.

Why is that woeful? We also outsource growing food to companies that don't always have our best interests in mind, but learning how to farm isn't really a staple of most high school curriculum. Pretty much everyone wears clothing, but I don't think it's a good idea to spend time teaching everyone how to make clothes from scratch. Nearly everyone in developed countries lives in a dwelling of some sort with running water and electricity, but it's not really expected that high schools are going to produce graduates with working knowledge of carpentry, plumbing, electrician work, and construction. Just because everyone needs something doesn't mean it shouldn't be specialized.

There is a marginal benefit to teaching a semester of basic cooking skills in high school, but it's small. I don't feel that most people are not "completely clueless", I'm going to claim that most people have at least some familiarity with cooking food, even just from watching their parents do it regularly. Most people are not going to get much benefit from a semester of learning how to cook pasta and make quick breads. I'll totally admit that there are some people who probably are completely clueless and this sort of course could be super-impactful and make a huge difference, which is why it makes perfect sense as an elective. Most people aren't going to get much out of it, so let's reserve it for those who really could use it.

Besides, like you said "every successful living person will have eaten". You're completely right that someone "might never math in the real world", but that also means that school could be the only place where a student is exposed to mathematics--whereas they're going to be exposed to food (and probably cooking) just as a consequence of growing up.