I think it's a bit conspicuous how you mention good ECC for printing stuff out, since good ECC is a staple of many forms of storage (especially hard drives, optical drives, tape) and we don't mention e.g. "storing bits on spinning rust with good ECC and reading it back in again".

I think the problem with paper is thot it's not really part of the computer any more. You need a human to take the paper out of the printer, store it, and put it back in the scanner. At least with tape and optical, we have robots to do that for us.