I don't see anything remotely pretentious about the term 'fine art', given that it is kind of a term definition to distinguish things from other fields, and as far as I'm aware has been well established in English for centuries.
It isn't "Art which is of high quality", but rather "A craft carried out with care", and historically divided artistic efforts made for the art itself, vs artistic efforts to enhance an otherwise functional object. The line can at times get a tad fuzzy, as it can be argued that a pot or cup that was only intended for display rather than use would then be a fine art piece rather than an applied art piece.
For my photography I tend to break my work down into fine art, documentary, and technical, with some overlap between the groups. If I go looking for a photographer to buy a print from to give as a gift, then I'll most likely start looking around local fine art photographers. If I need a lab assistant to photograph, document, and catalogue sample materials, then I'm not going to start that search on a fine art forum. Different skills, different tools, and different labels.
As for gear lists, I think that comes down to the photographer and the clients they're dealing with. I feel that if you're going after a lower end, but not bottom dollar, photographer market, then clients seem to want some reassurance that you're not just another Bob with a Camera, and that you have gear that you'll be bringing with you is better than they or their friends are likely have themselves. If I show up to a mid tier wedding with my old canon T3, and half the guests are using models half as old or newer, then I'm probably going to have a rather annoyed bride on my hands if anyone points it out to her. Perceptions are important. The lowest tier is paying bottom of the barrel rates, and seem more willing to accept what they get, and higher tier clients are more likely to focus on end results and artist connection/experience where the gear is largely a non-factor.
And lets face it, with modern digital photography there isn't a lot to differentiate the work of a lot of mild level photographers as there is a wide body of visually good but not overly distinct photographers out there. So, when Photographers A, B, and C are all producing near identical images for their site/blog, with similar rates, then why not pick the photographer who is showing off the higher end gear? It is frequently the only metric that is readily judged and easy to measure or make clear.
I don't photograph weddings at all to be honest, but I still get lots of people asking me about the gear I use as it is, especially if I have any of the film gear out. If I ever put together a site for my work then I expect I'll be including some sections dedicated to the gear I work with, and why I've chosen to work with it, simply because people find it interesting and like to know about it.