Memorizing seed words can work for temporary, high-risk situations...but what if end up in such a situation suddenly and without time to transfer your coins to a wallet for which you have memorized your seeds?

Border wallets is cool, but you have to keep a copy of the grid (unless I'm misunderstanding how it works).

I think Emergenseed is trying to add a third option that allows users to generate mnemonics that are easier to memorize, but still temporarily safe against brute force attacks...but their documentation is a little unclear to me. Looks like a neat idea.