This is not a discussion of photo scan in general... This is also not a discussion of general contact printing.
I shoot MF, from 6x4.5, 6x6 to 6x7. I always scan my film with my Epson V750 scanner (without processing). I save it to TIFF for archive, and convert to jpg/png if I want to upload online. I also have a make-shift darkroom and make large prints from my negatives.
I did some contact proof prints from the negatives. But with the electronic scan, I'm not sure if I still need the contact proof scan. From the scans, I know exactly what photo I want to print. I think this is exactly contact proof is for.
Please let me know if I'm missing something from the contact proof.