Using tokenURIs from ERC721 to store land/object's properties, containers etc.

[hackfisher]

Including:

buildings on that land.
outside URL and links.
images
decryption.
industry indexs.

[hackfisher]

https://medium.com/blockchannel/walking-through-the-erc721-full-implementation-72ad72735f3c#8577

But why not directly use another mapping (uint => struct) for storing this informations?