[Arwill]

Mobile phone App/Passkey authentication is just a way to pass the responsibility down to users. Losing a phone today is not just losing the passkey, there are "login with QR-code" schemes too, which do not need a password at all. It is a bad trend to pass all security onto the physical phone.

[KingOfCoders]

And good luck when your account is closed by the company, e.g. Microsoft or Apple or Google.