Not just availability of film. 4x10 film would be special order or cut from 8x10 film. 4x10 film holders are not common items..
Beyond these two items, camera size, weight and support system, case for all items required including film in holders must be considered. Oh, there are lenses, film processing and more..
Using half a 4x10 might appear to be a reasonable-good idea until all the other factors are figured into the harsh reality of making 4x5 images with 4x10 system.
Bernice
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