I want to have both, a hardware key and a password. A password alone always has to grant me access again, ideally without needing to register a machine too. Honestly I hate that this is so widespread already, I want my devices to be a non-recognizable ghosts for security purposes. An access log would be more appreciated.

I have a Yubikey and use it as a part of my passwords. But I would like to have a second master password that I only use in emergencies. Yes, it is easy to forget so make sure you don't. But a password that is rarely used is also rarely exposed to third parties.

To be honest, the most problems I see with FIDO is the lacking trust in the alliance of companies behind it but I don't know too much about the technicalities of FIDO.