A few points from Wiki sticking with Ansel Adams as he is most relevant to photography. He associated and learnt from many other artists and photographers, see Wiki extracts below
andIn New Mexico, he was introduced to notables from Stieglitz's circle, including painter Georgia O'Keeffe, artist John Marin, and photographer Paul Strand, all of whom created famous works during their stays in the Southwest. Adams's talkative, high-spirited nature combined with his excellent piano playing made him a hit within his enlarging circle of elite artist friends.[32] Strand especially proved influential, sharing secrets of his technique with Adams, and finally convincing Adams to pursue photography with all his talent and energy. One of Strand's suggestions which Adams immediately adopted was to use glossy paper rather than matte to intensify tonal values
He clearly was not all "self taught" and nor was he against education within photography, see belowhe joined the prestigious Roxburghe Club, an association devoted to fine printing and high standards in book arts. He learned much about printing techniques, inks, design, and layout which he later applied to other projects.
Looks to me like Adams did not have a problem with learning and with students wanting to be taught in a formal fashion.He also taught photography by giving workshops in Detroit and his pupils included future photographer Todd Webb.[41] Adams also began his first serious stint of teaching in 1941 at the Art Center School of Los Angeles, which included the training of military photographers
Really? Adams received a Doctor of Arts from both Harvard and Yale universities. He was elected a Fellow of the American Academy of Arts and Sciences in 1966Ansell Adams and the other great photographers were self taught, not a degree to be seen