I love Ansel Adams, admire a lot of his work, but I have to say, "
photographs that look like photographs" has got to be, in retrospect, the most absurd, nonsensical statement ever uttered about photography

. A photograph can only look like the thing photographed, to paraphrase Winogrand, and I certainly hope that that's what Adams meant.
What Adams couldn't (or didn't want to) see was that the medium contained within itself possibilities which, through exploration and experimentation, would lead to the development of new art forms that had nothing to do with existing art forms. One can point at the development of abstract photography in the 60s and 70s, but that Adams would write such a statement at a time when people such as Sudek, Man Ray or Moholy-Nagy were starting to explore the possibilities of the medium shows that there was a bit narrow-mindedness at work, or, at least, an ignorance of what was going on elsewhere (understandable in a context in which information wasn't as readily available as today).