Similarly, plumbing literacy is very broadly useful. Even if you never become a professional plumber, you will probably benefit if you can figure out why a toilet or sink is not working as expected.

Yeah, if you turn the pressure off and are careful, you can do a lot of poking around. Like with computers. Turn the power off, and you can poke around quite a bit. Not so much with phones and modern day laptops though :/

Being able to fix your own sink is actually a useful skill.

Duct tape.

With a large enough roll you could rule the universe.