If you are talking about commercial art, where the end product of the photographer's creativity is something with a purpose other than to exist, then I agree. But if you are talking about art then I vehemently disagree.
The process of making the art determines the path to it's creation and the drive of the artist to create it in the first place. The art piece would be completely different if made with a different medium and process. So in that way, the process is paramount to the viewers.
No, I'm talking about all of photography, making no distinction between commercial or fine art. And I agree with you that what the artist does with the work indeed affects the outcome, so that the viewer indirectly "sees" the results of the artist's craftsmanship. My point is that to the casual viewer, the details of the process (the level of minutiae that is obvious to the craftsman) is essentially invisible to the outside world, and most could care less. Especially with visual art like photography, that can be viewed as a physical print, but more likely viewed online as a JPEG image, the medium that portrays the image becomes immaterial to the casual viewer.
For instance, I can engage in a deeply hands-on process of chemically toning a fiber print, a skill earned through years of experience and trial and error. And then the finished result could be scanned and posted online; yet to the casual viewer the results may not appear any different than clicking on a preset in Photoshop and "tinting" an image digitally. The point is that, to the casual observer, the level of experience, hard work and hands-on skill in the craft of creating and toning a silver print is all but invisible, and therefore imparts zero value to the image.
When you state that "The art piece would be completely different if made with a different medium and process," that is only true when viewing the piece in the physical realm. But in the virtual world of software and the Internet, all bets are off, essentially any effect that can be done photographically to a physical print can be simulated in software; and the material attributes of physical works of art all but disappear online; hence, one's process becomes invisible, all that is left is a simulacrum that more or less simulates the end visual affect, minus the physical attributes, and the intermediary process all but disappears entirely.
~Joe