To put it simple, I like to think of NFTs in general as art. You can have a print of an art but the original will always be more valuable. They are not very liquid as you need to find a buyer for each specific piece you hold.
NFTs aren’t just pieces of art or pictures though. They can have utility in them. For example, by holding Project A’s NFT you can get access to exclusive things, certain communities, etc. Essentially the NFT is a membership card for exclusive rewards through the use of smart contracts.
With ERC404 and similar tech, you are able to immediately liquidate your NFT as the tradable coin and NFT are one the same and inseparable. I like to think of it as:
With old NFTs you are gaining a piece of art, value is subjective and you need to find a specific buyer.
With the new ERC404 you essentially are holding a commemorative coin. That coin can instantly be traded in for value, but has a piece of art combined with it. Like having a $1 coin/bill with a special design on it. You can take that to the store and instantly receive $1 worth of trade value, or you can hold it and sell it on the open market for more. But the floor price is always $1, and it is extremely liquid unlike just a piece of art.
This is a pretty decent article on what ERC404.
ERC 404, an emerging token standard on the Ethereum blockchain, represents a significant innovation in the realm of digital assets.
zerocap.com