Top notch security upgrade to XF2!
I did find it a touch confusing that I still had to u/p log in after enabling a passkey though. Passkey's, with this plugin, are just a secondary authentication method. You can't use passkeys alone for authentication. I suppose that it'd take some work from the Xenforo team to completely replace u/p with passkeys?
Also would you really want someone to be able to log in without any credentials whatsoever just because they had physical access to a hardware key? Probably not, so then you are back to needing a second-factor auth for the passkey which kind of defeats the purpose of password-less login.