All in all, we all have our own styles. Some like going by the book and some don't. I feel music is an expression of ones mind and soul. It is an art form that varies in many, many styles, tempos, and sounds. There is A LOT of music out there. Who are we to say what the "proper" way of making this music is? Not going by music theory is NOT going blindly. Some of the most famous artists of all time started out when theory was non existent. Some of the most heard tunes in the world were composed by men and women sitting down at a piano and experimenting, learning, and crafting their hearts out into beautiful sound. As culture and the world progressed, we formed equations, language, and concrete descriptions of what this music was. We took it apart and explained it. That, in itself, is pretty amazing as well. There are still people who are developing upon this theory, attempting to explain the most complicated building blocks of music.
Not knowing this theory has NOTHING to do with talent or skill or arrogance in an artist. It is simply a PREFERENCE.
Everyone has their own ways of composing music. I am a piano player, I program synthesizers, I DJ, and I am an Ambient Producer. I know some theory, but 99% of my skill has come from sitting down and pressing my fingers against keys, turning knobs, and analyzing frequencies. I don't need a book to tell me what is going on. Sure, it would help. It would help a lot. I pride myself, however, in developing my own techniques and styles. I don't want to base myself from something made from somebody else. i want to achieve pure emotion through sound. Personally, I feel learning advanced music theory would almost corrupt everything that I have learned. Sure, there would be nothing wrong with learning music theory. But... It is so much more fun to learn it for myself!
In fact, experimentation is why we evolve! I want to be unique in my music. If I focused too much on theory, I would't cry when playing the piano, I would think to myself "oh ok time to move onto the chromatic scale". That is how many play. There is nothing wrong with it. Using theory is a beautiful thing as well. Not using it is equally as beautiful. That is my opinion.