Most writers and artists aren't terribly articulate about their own work, even if they are articulate critics or interpreters of the work of others. Ask what it's about, and you get more text to interpret, and I think that's as it should be. Artists who know exactly what they are doing, or who think they know exactly what they are doing, are probably doing formulaic work.
I think it's most interesting to hear photographers talk about their subjects or their process, and that's enough of a story. Part of what makes a work of art interesting should be as much a mystery to the person who creates it as it is to the viewer or reader.