NFTs only assure ownership of the NFT data itself, not what the data may represents off of the chain or otherwise. The only people who think/claim that you now own a PNG or a lease by storing a link to one in a blockchain are idiots or people trying to sell things to idiots.

Assuring ownership of the data itself in a decentralized way has value outside of this current fake / grifted meme of owning a random PNG. It's tiring that a community that seemingly prides itself on technical understanding gets so hung up on an overused fake use case.