But if you want that Sally Mann/Alec Soth/Paul Graham sort of look you're just not going to get it from your dad's hand-me-down OM-10 no matter how good your concept and execution are.
Maybe, just maybe, there's someone who started off saying "Ok, to get that awesome color palate and detail, I have to start off using 4x5/8x10." I've never met one of them, though.
And that's to say nothing of people who rotate through different gear because they're looking for a 35mm/6x6/whatever setup that feels invisible in their hands. People talk about Leicas that way. Could/Should/Would people just accept whatever gear is in their hands and make great photos? Engh. Anyone who's met me knows that I'm not going to be comfortable in a size 36 jeans or size 7 shoes. Why not find something that fits?
Now if/when someone gets to the point where casting about for gear takes the place of making photos? That's another issue, a pathological one that should be remedied with a prescription of one full day off, five rolls of film, and $15 for beers or coffee to be had throughout the day while making photos.