Comment by ThunderSizzle

I think the point is I can make a physical copy of my backup email and password. How do I print a passkey for safekeeping?

In other words, my email can be signed in from anywhere on purpose. It's a feature. The chances of me forgetting my password is zero, because I can back it up 7 way to Sunday.

A passkey seems to miss these basic accessibility issues. For a random website, that's fine, but for the service all of websites use to auth me, access is more important than locking it down to one device.