FIDO’s approach to passwords, while convenient, first reveals a dangerous confusion between access and identity. Contrary to popular belief, the two are not interchangeable. Identities are fixed while access keys are changeable. In the physical world, we use them for different needs.
Your identity is used to identify yourself, for example when you cross a country border, when you need to prove you have the legal rights to live in a country or to live in a house. Your legal identity is fixed and doesn’t change when you change job or country. Your identity is unique.