I dislike passkeys because they support remote attestation. It's my key -- why does the website care what app I'm using to host it or if I'm allowed to copy it? Or what operating system I'm using, for that matter.

Because of this, I will not use passkeys. It's a slippery slope. Once we're all on passkeys, website devs won't resist enabling the remote attestation bit, locking out linux users.

Passkeys aren't tied to any specific app or operating system.