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 suck...
The current security philosophy almost seems to be: "In order to make it secure, make it difficult to use". This is why I propose to go a step further: "In order to make it secure, just don't make it". The safest account is the one that doesn't exist or that can't be accessed by anyone, including its owner.
I use a password manager with passkey support and still disabled all my passkeys. The user experience for passkeys is so much worse even when support exists.
I'd like to hear more about the specifics if the issues you ran into. I keep delaying my options to start using passkeys because it's a lot to take in at once and the only services implementing them seem to be the most important ones that I really don't want to experiment with my ability to acess them. I haven't even been looking at the details of each service's implementation.
It's a combination of issues. First is compatibility issues. Like logging in on mobile web or app with a passkey doesn't reliably work for me. It might have been due to the password manager, but for some things the option wasn't even there afaict. If I'm going to really switch to passkeys, I want it to work more reliably.
The second is usability. Passwords in a password manager are a 2 click entry on the username or password form field. Password managers have streamlined this system over the past decade.
Passkeys, ironically, required more steps when pulling from the password manager, including required clicks in less convenient places. I hope these types of issues get ironed out eventually.
When I was trying out passkeys, things allowed either passkey or password still. But yes, I think this need partially reduces the security benefit of passkeys.
Using a security key as a password managerpasskey seems to resolve this issue (I think?), but I guess the issue is more a problem for the casual user who wouldn't bother with a security key!