Thomas 99% of all photographers never saw a darkroom in their life, they put their film in the camera and when it's finished they go to the next lab and have it developed and printed in short they do not know a lot about the whole work flow especially not compared to a painter or sculptor. Like Varya I am an artist by training and when I walk around I see what I want to capture not what I want to frame there's a big difference. If my mind were calibrated to a specific focal length, that's what happens when you only use a single focal length, I would miss 90% of all good photo opportunities simply because I would overlook them.