As I've said elsewhere and I quote:

"I love hardware keys, passkeys etc, I appreciate the value proposition.

What I don't like is the centralisation by developers integrating them using Google/Apple API which don't sit outside of their invasive system services.

Sandboxed Play Services by GrapheneOS helps in this regard."

The ideal is to still see open implementations independent of Big Tech. You shouldn't need Google or Apple for accessing none Apple/Google services.