You can still accidentally leak your password via phishing or malware. 2FA is fine if you don’t tie it to a phone number, simplest way: install any authenticator app for TOTP tokens. Scan the QR code on multiple devices like phone + tablet, or old phone, for redundancy. Or save the secret key.
Google and most critical services also give you a list of 10 single use emergency codes that you should print or save in Keepass - lost the phone? Nbd just use one of the codes and reset 2FA.
I also never thought my non shared password would be public but one day I suddenly got prompted on the authenticator if I wanted to login; still no idea how or why but at least no one could get in and immediately rotated out the password.
lmmarsano@lemmynsfw.com 2 hours ago
Nah, a password authentication or anything that transmits the full secret is beyond primitive. Passkeys, client certificates, OTP never transmit the secret key. With passkeys & client certificates, the server never has the secret key, so it can’t expose it.
Problems due to phone loss indicate bad practices. Any decent password manager or vault service can manage cryptographic credentials of any kind.