I'm surprised nobody has mentioned this but you can also use a hardware FIDO2 token for Webauthn. Like a Yubikey. This is ideal if you use many computers.

If you need to sign in on a borrowed computer you visit the site, it'll ask you to insert the yubikey (if not already), you enter the PIN code and touch it, that's it.

I believe a yubikey with fingerprint instead of PIN (or additionally? Information is scarce on it) is also coming.