Well, this is getting interesting. Not least for me because jdef and I are communicating civilly, for which I am grateful.
First, although some might call that side of me "mystical," I don't see it that way. My understanding of these things is based on science, although admittedly, not mainstream science, and science that others might indeed call "mystical."
jdef: " However, I feel that to deny that digital photography is in fact photography is a logical miscalculation, and the assertion that digital photographers are less serious or less valid than traditional photographers is elitist, devisive, and counterproductive."
I happen to think that digital photography should be called something other than photography, but I believe that digital practioners are no less serious or valid than those of us who work in more traditional media. Many of them, in fact, are harder-working and more serious. And certainly, what they do is valid. As far as art is concerned, it does not matter how it is made, or what the ideas are that are behind it (to touch on that other concurrently running thread). Ultimately, for visual art, the only thing that matters is what the work of art looks like. For me, a major problem with digital is that the results are not as beautiful as those produced traditionally. If I thought they were, it is not entirely inconceivable that I might work digitally myself (although there still is that energetic problem).
Other: Light energy and electrical energy, I believe are fundamentally different, qualitatively. Light has a living quality; it moves in waves. Electricity is jagged (think of lightning). On some level, and I cannot explain what that level is--way beyond me--I feel that is what makes the difference. (I feel it--maybe that would be called "mystical" by some.)
Equating a photograph to reality: Photographs are real. Very real. They are real photographs. As jdef said: [real] "grains of silver." They are not the scene, but abstractions of that scene, object, person. Abstractions that have certain physical, and I believe, certain energetic, qualities. But they are clearly not reality. People, most of them anyway, are not as literally two-dimensional as their portraits are.
Ultimately, none of this matters at all. At least to me. I make photographs because I get deep pleasure from the process of doing so; if I felt otherwise, I would stop immediately.