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You buy the right to sell that digital piece - others can copy as they please, but only the owner of the NFT can sell/transfer/destroy it (depending on the contract, of course).You can copy the digital piece and distribute it as much as you want. An NFT is just a record on a blockchain saying that [wallet address] is the current owner of [URL]. It has absolutely nothing to do with ownership.
The creator of an NFT can legally create a contract saying "whoever the blockchain says owns [URL] is the owner of [piece of art]," but that is a minority of cases and it also depends on the legal system. Ownership relying on a legal system is not new and it doesn't require NFTs.
> saying clonability invalidates something as art would also invalidate music, video, and any other fork of digital content
I didn't say clonability invalidates something as art. I said clonability invalidates NFTs as a meaningful form of ownership in and of themselves.
> You can’t “copy the list of owners” either, not sure where you got that from.
You can sell an NFT of the Mona Lisa. I can also sell it. That means there are two NFT ownership records for Mona Lisa.
In fact, there can be infinite ownership records. The only way to tell that a certain ownership chain is the original is by checking timestamps, but that doesn't tell you anything about whether the original seller of the NFT is also the owner of the work of art.