If your public interface address can change, it does dramatically reduce the value of a purely IP-addressed host. But I don't think it eliminates it entirely.

If your public interface address can change, it does dramatically reduce the value of a purely IP-addressed host. But I don't think it eliminates it entirely. With a dynamic IP you can still detect a change, reissue a cert for the new IP and proceed automatically. There are self-hosting and machine-to-machine scenarios where this amount of autonomy could be welcome.