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...
I need to sync my passkeys between all my devices–which really means I need keepass to store the private keys in its DB so I can sync it with all the other keepass-compatible apps I use in various places. Last I looked, this wasn’t solved, but it’s been a minute. I’m certainly not using a centralized password manager unless they all can freely import and export from one another. I understand this is a “being worked on” problem.
So someday, yes.