The only tangible different is that once you've establish the meatspace laws, the ownership can be transferred on chain and still hold a valid claim, instead of having to result in meatspace in order to transfer it.
What you could do is retain the copyright yourself, but accord an open-ended copyright license (like the way oss licenses are written) that accords certain rights to the owner of the NFT (and have the license describe how to determine who is the owner of the NFT).