I think anybody could improve the way they work by forcing ourselves to work with what we've got.
There are clearly several different thought patterns regarding this topic, and in the end I think we probably mean similar things.
In my humble experience I have noticed that when I become truly familiar with a camera, and when I use a film that I am thoroughly used to, my prints improve. When all my focus is on the image itself, and I can raise a camera to my eye where I have a good idea of what the finished print is going to look like, then I feel artistically free and have a clear head, where the full emotion of being in a place occupies my soul and hopefully permeates the resulting photograph BECAUSE I am not distracted. That is my experience with the Hasselblad camera I have used for years now, and the Pentax SLR. I haven't quite gotten that comfortable with the Leica yet, so I'll be practicing more with it. The only film I use when it matters is Tri-X (or TMax 400, which I have also used a lot). The only paper I print on is Ilford MGIV fiber. When I go out shooting I only ever bring one lens. Why? Because the moment I start thinking about changing something, I stop paying attention to what's around me.
Maybe it's a personal way of working that isn't right for everyone. We all enjoy different things.