Came to post this too. It's such a genius solution.

You can post the entropy grid all over the Internet and you're not compromising the security of your seed.

Create indestructible physical copies and digital copies you can access anywhere. If you ever need to suddenly leave your home and don't have time to take the physical copy, just get access to the digital copy once you're safe.

It's good practice to also use a passphrase, and then all you need to remember is the shape your seed phrase makes on the entropy grid and your passphrase.