[JohnFen]

> you can no longer manually type the passkey in on random devices that don't have your password manager on it

This is a huge problem, though. My password manager has no online component, and only runs on my phone. On purpose.

When I use it, the password manager shows me the password that I need, and I type it in manually.

I could change to a different method, but then I lose a lot of flexibility. I can no longer log into things from machines other than my own.

Things like Yubikey address some of this, but then I can no longer log into machines unless I have sufficient physical access to plug the key in.

To be clear, I'm not arguing that any of this means passkeys aren't desirable, but I am saying this to point out that passkeys are not functionally equivalent to passwords, and passkeys do restrict some kinds of use.