I think it's because it's a pain to have one key per device. To solve this, you'd need a service like iCloud Keychain (for Apple devices), but that only works f

I think it's because it's a pain to have one key per device. To solve this, you'd need a service like iCloud Keychain (for Apple devices), but that only works for Safari and other Apple stuff. I think once 3rd party apps (like 1Password - see https://www.future.1password.com/ https://www.future.1password.com/) start supporting the syncing of keys, you'll see more use. Alternatively, if you could use iCloud Keychain with Chrome and Firefox, maybe that would work, too. Looking forward to this future!