Wait a moment, are ERC721 tokens unable to save a string of text?.. If that’s the case then it greatly limits what can be done using this tech. 
Hell I cant even assign ownership over a IPFS hash so the game knows who owns what files in the game…
edit : I know its possible to save text on a transaction though.
So like, for example the name of an account someone is using.
IPFS hashes for things like ownership of worlds and Avatars.
The ability to post short messages as well.
being able to post text has a lot of uses for sure.