people have taught me to shoot a basketball, no one has ever taught me to throw a rock or a ball. I have seen others throw things and that was plenty to teach me. From there, better throwing can be learned with simple practice. Can tips and pointers accelerate that learning? Yes. But it is not MANDITORY.
no. Martial arts can be learned intuitively, that is simulated by brawling martial art. Its not refined, but its there.