This seems like an excellent way to ensure that you reduce the security of your SSH login to either having a single-factor (password) or at best single-factor + TOTP, where you previously had a phishing-resistant cryptographic protocol.
Is this really an improvement for security, or is it just a usability improvement (i.e. sync of keys) intended to work around policies trying to improve security (i.e. required use of keys)?
(The other option is I skimmed the docs badly and maybe I've misunderstood something, it's possible.)
Edit: I did skim the docs badly, it is possible to use a FIDO2/WebAuthN key for 2FA. https://support.1password.com/security-key/