Is it physically possessing something? Is it a receipt? Is it provenance? Is it the ability to destroy something permanently? Is it the ability to deny others access? Is it irrefutable and verifiable proof, without trusting any single entity, that an entity holds an exclusive status relative to a good?
minting a completely image onchain is also not too expensive and can also be passed on to the community, as most relevant NFT collections are minted by the community and not the artist. people stand up their own websites for this, the people minting their own artwork directly on the marketplaces are their own segment and that has remained a race to the bottom with starving artists crowding it.
Ownership has limits, in the real world those are regulated by the government. In the digital world they can be regulated by a DAO. But ultimately, there are benefits of ownership, and responsibilities to ownership.