I think this is really great news and am glad to see FIDO move forward as I think it greatly increases account security.

One aspect of FIDO that could still be troublesome is account recovery in case of inadvertent loss of passkey. OOB recovery with SMS or email is considered too weak and the main recommended alternatives are to maintain multiple authenticators (i.e. multiple copies of your passkeys), re-run onboarding processes for new users or just abandon the account.

It's going to be interesting to see how those alternatives play out in real world situations.