I believe that it's possible for there to be a reasonable use case for a pointer to something that changes, though I'd appreciate an example because I can't come up with one. If it links to something that's not on some sort of blockchain, then what's the point?
If an NFT contains a normal URL, how could that possibly be valuable? The domain could expire or be transferred, or the original server hosting it could go down. I can't imagine any NFT that holds "ownership" of a real world tangible asset having any meaning whatsoever.
Imagine a logistics system that uses the existing capability of NFTs to give all interested parties a clear and transparent view of ownership transfers, eg factory to container ship to port etc. The data underneath can only be modified by the current owner of the NFT. The off-chain data could be encrypted and fit the particular companies standard.
The blockchain need not contain 100% of the business logic for a use-case, but instead only the parts that are relevant to being trustless and public.
If an NFT contains a normal URL, how could that possibly be valuable? The domain could expire or be transferred, or the original server hosting it could go down. I can't imagine any NFT that holds "ownership" of a real world tangible asset having any meaning whatsoever.