It's funny, I learned a pile of languages in my undergrad and some UML nonsense. None of it covered properly how to write code that was meant to be read, which IMHO is one of the most basic things.

Just "hey nobody can understand why that line is the way it is, what should we do about that" is probably one of the basic building-block skills of developing on a team, and you teach it wholly by abusing prima donna cowboys until they write something legible or quit.