[CrendKing]

> Yet last I tried on Google having a login/password is mandatory

I just tried and all I need to provide is the email ID and passkey. You need to use the "Try another way" option.

If implemented correctly user shouldn't even need to provide the user ID at all.

[Galanwe]

Maybe I did not explain correctly. You _can_ login with passkey, but you cannot remove your password and only use passkey.