It doesn’t have anything to do with using the same password on different sites.
My password manager can’t even detect the first password field.
reset it via email.
And one day when one mistypes the single new password, when changing their password on their email account itself, or changing the master password for their password manager program, then there is nowhere to send the rescue email, and it’s “Ground control to Major Tom”…
(Gmail users probably need to set up a tent outside Google headquarters.)