Absolutely. I worked without effective teaching for the first five years of my career, and I was okay at my job. But I learned more in the first six months with solid feedback from skilled developers than I had in five years of stumbling around on my own.

There are also skills you basically can't teach yourself, especially how to make code that is easy for other people to collaborate on and how to teach others effectively. People who focus on teaching themselves are doing themselves & whoever has to read their code down the line a disservice.