The use of the term art medium is, to say the least, misleading, for it is the artist that creates a work of art not the medium. It is the artist in photography that gives form to content by a distillation of ideas, thought, experience, insight and understanding.
When I first became interested in photography, I thought it was the whole cheese. My idea was to have it recognized as one of the fine arts. Today I don't give a hoot in hell about that. The mission of photography is to explain man to man and each man to himself.