I think passkeys were made to work in mind with complete idiots (here's a pop-up, tap it, now you have access to website without password, don't think about where it was saved or that it exists at all). I can understand parts of IPv6 like Router Advertisement being like that but there is so much customizability for the user that I can't really see them being similar that way.

Except they never considered that "complete idiots" could lose access to their phone's passkeys.