I think that Stephen might be more of the exception than the rule. And as he is far from being a beginner, he can take better advantage of a multiple tool kit. But most beginners will benefit from sticking to one camera and one prime lens for a few years -- and perhaps some more advanced photographers would benefit from simplifying their kit for awhile, especially if things seem to be getting a bit stale for them.
As Stephen suggests, which tools (in this case, lenses and formats) one wants to have along is best left to the individual -- and the proof will be in seeing the results. In the 20+ years I slowly moved up in format (120, 4x5, 5x7, 8x10), with one lens per format, I never found myself lacking in yield nor creative potential. With one lenses and one format, one will never run out of images to take -- they will differ from the set of images one might take having multiple formats and lenses, but not in quality.
After ten years or so of 8x10 use, I now carry 4 to 5 lenses and an adapter to also take 4x10 images. These tools give me different creative options, not more and not better options. And they strengthen up my legs and lungs...LOL!
Vaughn
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