I have a question - something that's puzzled me and I must be missing something. Nearly anyone who has a 5x4 camera more than likely has a 5x4 enlarger, right? (or at least is trying to find one!). Roll film backs come in a variety of formats/sizes and invariably cost ~$100 upwards. 8 shots to a roll of 120 probably $5 a roll, so ~65c a shot. 5x4 costs twice that per sheet, but overall cost is still low.
Why would someone not just use 5x4 film, and crop it to the size? If you only had a 6x9 enlarger etc I could understand it....
What am I missing?
Nothing. You got it right.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.