I can understand why they made most of the choices they have, for the reasons given by John 2. I suspect they'll have to revisit the IR one, though. I don't see why those who use IR to shoot wildlife at night should not be treated as bona fide nature photographers - I don't think the use of IR gives anyone an unfair advantage. In other forums I've seen the suggestion that such photos properly belong in a "scientific imaging" category, but I disagree.