That's a shame, because often I think people that have competence in a subject come naturally to them end up at a disadvantage later, because their foundational knowledge is lacking (at least in cases where that's possible and learning was self driven).
One example of this is learning a programming language through doing compared to actual study and research. By "doing" I'm not referring to a project to cement details, but for example how most people know bash.
Another example would be spoken languages and some of my college professors. I'm not sure I ever heard anyone speak with as good of a vocabularity and diction as one of my CS professors that English wasn't his first language.