I truly mean this to be thoughtful and not antagonistic, and your notion of value being subjective is accurate. But I think I can somewhat snarkily summarize a lot of the doubt some HNers are feeling (I'm not saying I agree or disagree): it's basically saying diamonds are like NFTs.
EDIT: Just did a ctrl-f for NFT and I guess I wasn't the first to say that, although those comments are much lower on the page.