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.