I don't use passkeys because I can't tell if they're a one-way door. If I use it once, can I still use passwords to log in in the future?

I also don't understand how the system works when things go wrong (someone hacks your account, etc.). I don't even understand all the ways things could go wrong with passkeys.

Seeing the comments here makes me realize I'm not stupid or ignorant for not understanding these things. Some people do understand them much better than me, but there is no universal answer that emerges after sufficient study.

I will continue to stay away from passkeys.