You don't need a blockchain to make payments either, but we have it.
Who's using a blockchain
just for payments? I'm using it solely for the entire financial sovereignty pack. There's no trust required, which eliminates tons of flaws. It's always online. It's hard cash. It's censorship resistant. It's faster than banks.
There's no way to have the above without a blockchain. Therefore, blockchain exists to satisfy these needs.
The thing is, you and me don't get to choose what others think.
We're trying to comprehend their way of thinking, though. We're having this discussion to conclude if the NFTs can indeed have a legitimate and practical usage.