This is just a way to tie your identity more closely to your account, it doesn't make anything more or less secure. Every big silo is trying to do this constantly and once you recognize the pattern you'll see it everywhere. Never mind the inconvenience to the users, all that matters is that you are known to the system wherever you are and on whatever device you are using so that your profile can be closely matched to your various interests and intents the better to sell advertising (or your data, depending on the operator).
My recommendation: get a yubikey that you wear on your keyring, it's not as cheap as a password but it adds another layer of security without an even closer tie to you as a person, you can usually associate more than one yubikey with an account which gives you a way to diffuse ownership of the account without tying it to a particular computer or phone. And stay away from biometrics if you can.
My thoughts exactly.
In the post linked and in the post explaining how passkey works they mention that none of biometric data is sent to google. The catch? More precise data about your devices and subsequently about you.
My recommendation: get a yubikey that you wear on your keyring, it's not as cheap as a password but it adds another layer of security without an even closer tie to you as a person, you can usually associate more than one yubikey with an account which gives you a way to diffuse ownership of the account without tying it to a particular computer or phone. And stay away from biometrics if you can.