Resident passkeys really are just the 2020-JavaScript version of X.509-based mutual authentication - naturally it's incompatible with anything but the web, sits

Resident passkeys really are just the 2020-JavaScript version of X.509-based mutual authentication - naturally it's incompatible with anything but the web, sits on a weird level of the stack, and is somehow even less transparent to the user. On the other hand, certificate slots still seem to run approximately a dollar each.