Enable the user to use a FIDO2 hardware key or an iOS or Android biometric passkey as the sole login method for users that desire it. It would be for all Proton services, in my case mail, drive and pass.

I would like to eliminate using passwords altogether and solely rely on a passkey in my iOS Passwords app OR my Feitian FIDO2 hardware key with fingerprint sensor.

Requiring multiple keys would be a way to help prevent users from locking themselves out.

1password is currently in beta with passwordless login and google already supports it.