It´s sort of an existentialist thing. People hate to think that other options exist because it throws their own choices into doubt and highlights that much of our values and choices are essentially arbitrary. See also religion, politics, attitudes to homosexuality etc etc.
I think arbitrary is a bit of a strong word. Choices are relative to our values, experiences, needs, wants, desires, biases, environment, etc. The circumstances that inform our ability to reason and make informed decisions about what we need and want may have been a result of arbitrary randomness of the universe, but that doesn't always imply our reasoning isn't based on sound logic and excellent, supportable justifications. If someone has a value or makes a choice without reflection, logic, and consideration for the consequences but instead only responds based strictly on emotion, external pressure, or the expectations of others then their choices are arbitrary. Chances are many people do behave this way.
Certain people view photography as a big part of their self identity somehow and since their actual photos aren´t always that great they attach that identiy to the gear itself, often believing that expensive equipment gives them some sort of status when in fact no one in the real world cares. Most of my friends think I´m clinically insane for paying more than 300 euros on a camera, let alone 800 on a lens that doesn´t even zoom!
What we love doing is based on who we are as a person, so it stands to reason that there would be some reciprocity there. Hopefully people would be able to avoid allowing that kind of thinking to influence their views of the world, but most people don't put that much thought into how they reach an opinion. Wanting expensive equipment in many cases simply comes from continuous study of a subject, knowing the differences between a cheap and expensive item that most people couldn't or don't care to notice, and then feeling compelled to maximize one's output despite any lack of skill in choosing a subject or fully controlling the process.
Gear fetishisation is also linked to a form of magical thinking whereby if great photographer X uses gear Y, If I also use gear Y I will gain X´s powers, in the same way that a tribal warrior might once have worn bear or wolf skins to gain those animals strength and ferocity or a bad literary novelist might use unncessarily convoluted sentence structures based on the false syllogism - Joyce and Faulkner are great authors who use difficult language. If I also write incomprehensibly, I will also be great. - This is how human beings´brains are wired, basically towards superstition, brand fetishism is just the latest version.
I don't think this is so much magical thinking as it is imitation. On the most fundamental level humans learn by imitating what others do in an effort to achieve the same outcome. Once we have the ability to use logic and reason we can simulate certain things intellectually or develop entirely new behaviors strictly in theory to test them out before actually physcially trying them. Those who become obsessed with the idea of being like someone else or as good as that person can easily mistake an imitation of how that person behaves and the skill that person has that others do not. I don't think this is superstition or magical thinking in this case, more admiration and desire match skills using easily acquired criteria that aren't, in reality, related to the skill itself. This is still primitive thought or lack of thought.
Of course people who can´t afford Leica´s or Nikon D800s and massive 70-200mm f2.8s will display another form of this whereby they will translate their own choice into being a sign of unconventionality that somehow makes them cool. In modern consumer society people use these identifications to fill that nothingness they feel inside themselves, to develop a fixed comforting identity, in Sartrean or Heideggerean terms, the Being-in-itself of an object rather than the angst-ridden Being-for-itself of a conscious entity.
Wow, those are some convoluted philosophical knots you're tying, but that doesn't mean they are incorrect. I don't personally agree. People are detached from society, insecure, and they are replacing those human relationships with technological relationships. Because this type of interaction only goes in one direction, the object receiving love and giving none in return, people do feel empty and insecure and any disagreement with their choice of techno-lover is not only an emotional attack on them but it is also set against the backdrop of an extremely lacking sense of self and self-worth. How would you feel if everyone you loved treated you with indiffierence? This is why people get so offended when their device doesn't behave the way they expect or desire; their lover doesn't love them back and won't even do what they ask them to do. It may even reach the point of elevating their technology to a God-like status or magical status, further detaching the person from reality.
The fact is, unless you need blinding fast AF, most shots can be taken on most cameras. People prone to the above resist this simple fact because it throws their whole photographic identity and minireligions into doubt. Looking back at my last 16 years of of photos taken on everything from a Minolta Dynax 7 35mm film SLR to Voigtlander Bessa R2 rangefinders (extremely primitive technology but charming cameras) to a Nikon D2x to a Fuji X Pro, most of my photos could have been taken on any of them the only differences being the maximum print size attainable, which is perhaps the least interesting aspect of any photo.
"Most" shots cover a whole lot of ground. If I'm shooting lightning most camera won't take the shot. If I'm shooting in a dim glass studio most camera won't take the shot. If I'm shooting products a camera without mirror-lockup and a remote shutter release will either likely vibrate or be a pain to use making the shot much less likely to be of high quality. If anyone is moving at a moderate rate of speed decent AF can easily make the difference between getting the shot and not. The ability to get a shot and get the shot you really want is a very fine, but important, line. Some of us who can spot the moment we want need a camera that can respond in that very moment. As for your own experience with camera equipment, all I can say is lucky you. I believe your criteria for shots and the criteria used by others might not match up exactly.