"Looper" tokens (opt-in ERC-20 and ERC-721 to prevent spam airdrops) are going to be the baby-steps toward my eventual replacement NFT token standard that I have been noodling around with for the last year.

For a few years I scraped and processed every single NFT ever minted on Ethereum. And it gave me some opinions.

Blockchain developer, scraping and smart contracts.

To be honest though, I saw so many NFTs that were so poorly constructed that no spec would have made the developers do the right thing. If you can't even construct a valid JSON document with matching quotes, no one can help you.

In particular: using a URI for token metadata is a bad fit if you are trying to assemble on-chain data into a data URI. In my experience the majority of NFTs did it wrong and it took significant custom intervention to process them. and the metadata properties are underspecified.