How many time did you lose your phone that contains all your 2FA ? or your hard disk along with your private keys, ssh or/and gpg? I did, aloooooot and it was excruciating every time, locked from your accounts, it is more likely to lose your phone/disk or have it damaged than your keychain. YubiKey is a physical hardware device, that can save different type of authentication, GPG keys, ssh keys, 2FA, and even static password. It even supports U2F with Firefox and chrome, which you can also use with Google now, and there is more.