It must be nice to be 100% sure of everything.
Sure that the only digital camera you need is a 35mm nikon, sure of what constitutes commercial art, fine art, personal art.
Sure that that no client can tell the difference between a Nikon or a tech camera, or for that matter any camera.
Sure that interesting imagery requires a "small footprint".
Sure that spending half your online time dissing a brand and a camera format to suit some kind of strange purpose is actually interesting.
Me, I'm not really sure about anything. Other than I know the more I offer, the more complete my production company, the deeper my investment, pre production, on set production, post production not only doesn't go unnoticed, it secures me work.
Why . . . because that's what clients say.
I look at Chris Barrett's work and I know that when I was an Art Director and if I was commissioning an architectural photographer, Chris would be high on my list. Because he can shoot straight angles, make exact but beautiful colors, show my building, my product in a professional atmosphere that looks better than "real" life.
As an Art Director I usually found it's a lot easier for someone like Chris to shoot highly commercial images, then let loose, let a few bystanders amble on through a image, walk around and hand hold a camera AND still give me two styles of imagery, than it is for someone with a photojournalistic background to multitask and shoot detailed commercial imagery.
I'm not 100% sure, but I think I know that why I like working a medium format file more than a 35mm file and I could explain it but it just opens up another chance for someone that's "sure" to try and prove me wrong.
Actually I am sure of one thing.
If I respect someone's work, I respect their way of doing it.
If Chris shot everything with an old polaroid I'd respect that.
Along with Chris, one of best architectural photographers I know shoots most of his imagery with medium format backs and tech cameras. http://www.timgriffith.com
One of the best car photographers I've seen not only shoots with a Hasselblad, shoots 35mm, does cgi and also owns three amazing production vehicles for producing still and motion.http://www.filmo-usa.com/ http://damonproductions.com/main.html
All three of these people come to the project prepared and with serious investment.
Or as Steve says, maybe they just like to use the cameras they want to use.