Personally, I don't honestly think this is always the case. If you give a man or woman a noise making machine for long enough, and he or she has the right heart for it, and time, he or she will produce something that you can call music. Sometimes, with time, and experience, technical itself can be redefined. There are plenty of brilliant self taught musicians who don't play things by the book.
In fact, we wouldn't have the blues a good majority of modern American music genres are created from if we didn't have slaves freed who didn't need have access to knowledge of the white world of music, and needed to create something new with their spirit. Sure, with the communal value eventually a rule set was built, yet in the end, it was created simply from experimentation.
Furthermore, Tons of musicians learn to play simply from taking their instrument and imitating things. Eddie Van Halen used to sit at home all day with his guitar trying to play along with what he heard on the radio. Some could say that's learning your technical chops in a way but really, it's more getting a feel of your instrument to ear.
I mean, to this day, Van Halen is pretty much considered one of the most influential guitarists ever, and when you think about it, his technique is incredibly improper and incorrect compared to ten or twenty years before him.
Fact of the matter is, proper technique helps, but no matter how you chose to learn, they're all just roaRAB to the same place.
