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Well "professional equipment" also follows fashion and trends. Remember when professional cameras had to be black? And how "proper" wedding photographers have to have a big camera? Memes and tropes exist everywhere...
Perhaps I should have wrote "Professional grade equipment", but, you are right, anything can be turned into a "Style", "Influence", "Look", or "Trend" and, we've seen Polaroid Land Cameras, SX-70's, Olympus XA's, Stylist MJU, Half Frames, Kodak Disk films, Giant Polaroids, mini-cameras, like the Minolta 16's, Ultra Large, Large Format, Nikonos, Polaroid multi-print strips, Instax in several formats, thin pocket digitals, etc, etc, etc.
Some of these are, indeed, Professional Grade kit, but most have been more or less, Fads or Challenges amongst Photographers, Art Directors, Editors, Artists, Art Galleries, Museums, and Publicist.
The bottom line seems to be, if you can make photographs, with a camera if any sort, that grabs the attention of Viewers and the Professionals in the Graphic Arts, you have a good chance to become a professional photographer with minimum kit.