The cloud syncing, I suppose. If you migrate devices frequently and have more than a single ssh key, it might make sense to log into 1Password instead of trying to securely copy your private key from one device to another.

It does seem like a weirdly specific use-case. I wonder if they're trying to instead target people who need to use ssh keys but aren't comfortable generating or managing them on the command line. With Github requiring SSH keys for command-line pushes, this is probably a growing demographic.