I do love the cloud version of passkeys, but I also have a backup YubiKey. I could do two backup YubiKeys, drop the cloud, and keep one YubiKey in a safe deposit box and one elsewhere, but I haven't had much reason to yet.

A passkey doesn't give up anything compared to a password, and is in fact much much easier to handle, IMHO. I have kept all of my private SSH keys in secure hardware for a decade, so perhaps I'm more used to carrying a physical key than others, but IMHO it's all better, all around.

We should eliminate passwords, and that has nothing to do with remote attestation, age verification, or anything like that.

For 20 years, I've only known two to three passwords at any time, and those are login passwords for separate boxes or corporate/home accounts. Beyond that, hardware access should solve everything, and I shouldn't have to type any passwords anywhere. Every account needs granular credentials, not shared credentials, but no user should have to memorize passwords beyond one per work domain.