Literally everyone in my country did, and nobody knows theory except a subset of musicians, not even all of them. Thus highlighting my point that the theory is inadequate, subjective, and immature in nature.

Whatever else music theory is, "immature" isn't one of them.

Western music theory has evolved over literally thousands of years. You can put a very rough start of it to Pythagoras, around 550BCe ish, which gives us 2,500 years of evolution and refinement.

But even if you want to start with the popularity and adoption of the major scale, that was around 1500CE ish, which gives us a solid 500 years. It handles many, many corner cases quite gracefully.

It undoubtedly has its quirks, but any notational system for this will also have its quirks (cf, the difference between systems of intonation). There is just no way around it.

That doesn't highlight anything except the tautology that music theory isn't taught in general education

Have you written any pieces?

I never had a music class at any point in school in California.

It exists in some California schools, but this is one of those things that exists because in some districts the parents setup a 501(c)3 whose only job is to fill the gap left by Prop 13 and Prop 98. My kid's had it every year, but in kinder it was a parent volunteer teaching it and in 1st/2nd the music teacher was entirely funded out of parent donations.