Personal anecdote to illustrate: the last time I tried creating and using passkeys for my Google account, I got the impression they (Google) would only accept keys coming from either Google Authenticator (their 2fa smartphone app) or something like macos's built-in keychain. No way to give them a key generated using a local, offline service that I could store however I want - it needed to be accessible using, basically, a big corpo['s software] as the intermediary. This coming from how their website would request the keys from my browser (which means mozilla seem to be in on it as well :/).

Given that I currently use a pure file-based password manager that I can move around and switch the keys for as I please, the current state of passkeys feels like a step back in terms of allowing me to control my digital identities.