Nobody expects to be taught how to do other menial things like vacuuming and ironing, for example.
Nobody may expect to be taught that, but from everything I've seen a lot of people could stand it. Least where I'm at, it's not uncommon at all to run into an adult/young adult who has no idea how to do a lot of basic personal maintenance stuff, or have an understanding of it that's... not good.
Parents have been increasing unable to really spend the time needed to thoroughly teach their kids stuff like that, and, well, schools are generally the backup plan for incompetent or incapable parents. Internet helps a lot, but there's still a
lot of people, young and otherwise, that don't really
grok the concept of an internet search. Or just don't know what to search for.
To the more general conversation, yeah, it'd be nice if teachers and the folks that dictate curriculum to them were a bit more on the ball about providing rationalizations to the learners about why they're being taught stuff. That's been a problem for a long while, from everything I understand. You'd think it'd be pretty easy to do, but to be fair to a lot of teachers they're often under a
lot of stress that makes stuff like that more difficult than it, by all rights, should be. If they had a better support network, or better training, that might alleviate things a bit, but, well. That would mostly take money, and even maintaining education funding is often like trying to draw blood from a stone, nevermind increasing it.