I disagree, but this is a common objection which is worth addressing. Specifically I disagree that NFTs are grounded in that particular conceptual framework.
NFTs aren't attempting to be bearer instruments which convey ownership of some physical good, or even of a piece of intellectual property. Those require a corresponding Ricardian contract. This remains a good idea, but, to put it mildly, there are unsolved problems associated with it.
A NFT is just a baseball card, what you're proposing is more like a baseball player packaging up 10% of his lifetime earnings into 5000 instruments and selling those.
Baseball cards have provenance, scarcity, and IP protection of their appearance: that is, they're demonstrably produced by a company with a right to do it, there are only so many in existence, and it's illegal to make identical copies of the baseball card.
NFTs have two of these properties and an adequate substitute for the third. They're signed, giving provenance, and scarce, due to blockchain-verified artificial scarcity. It's not illegal to make copies of the referenced digital artifact, because what fun would that be? No one could load the image or whatever in a browser.
Nor is copyright currently assigned. I don't believe it's conventional to purchase copyright for an artwork along with the artwork itself, but I could be wrong about that, and it doesn't matter: this would be a cool thing to add to some NFTs, but we can just agree that it isn't a part of the package right now and move on.
But it is impossible to make an actual copy of the NFT itself, even with the private key used to sign the original. That makes IP protection an inferior good: it's fraud to make a forgery of a rare baseball card, but it's quite profitable fraud if one happens to get away with it.
Disclosure: I own no NFTs in the usual sense of the term, and don't intend to.