Earlier quoted context omitted.
Where I grew up, a small EU country just knowing the local language would be super limiting. Here we learn Dutch, English, German and French in high school, and I picked up some Polish while living there. I'm not exceptional at all here and I'm nowhere near where someone who studies linguistics is.
Sure, and if you learned linguistics you would have been able to pick up those languages more quickly with a better understanding. But like I already said, most should learn languages for pragmatic reasons, what it offers them, not for some vague reasons. I guess my point was that there would be advantage to having people study linguistics in high school instead of a second (or third or whatever) language, give the s…
Language and music have a lot in common in that respect, it's perfectly possible to be proficient at either without having a very deep understanding of the theory as long as you are willing to put in the hours, and having that deep understanding is - as far as I've been able to discern - absolutely no guarantee for being good at making music or communicating with other people. It may help some but I doubt that it is the kind of thing that works for everybody in the way that you assert. It's hard enough to get kids to learn a new language, even if it has some direct applicability. Getting them to learn an abstract science which lays a foundation that they then may be able to apply to learning another language may well be one demand too many.
Still, for whoever it works it may be worth the extra investment in time and effort.