We had originally planned to go all-in on passkeys for ONCE/Campfire, and we built the early authentication system entirely around that. It was not a simple setup! Handling passkeys properly is surprisingly complicated on the backend, but we got it done. Unfortunately, the user experience kinda sucked, so we ended up ripping it all out...
For somebody complaining about making things complicated you certainly complicated the s*** out of a short post.
Storing your passkey in any of the shared password managers solves almost every problem you’ve listed.
With bitwarden and I have offline access to my passkey. I don’t know why the hell you’d need offline access to your pass key because they’re designed to protect online systems, But it could if I wanted it to.
With Bitwarden I can use my phone, or I can use my browser, or any one of four other browsers, or any other computer.
If I need to reset one of my pass keys I reset it in one place and it gets reset everywhere.