Earlier quoted context omitted.
OK now say you're on a work/library/friend's computer and you want to look up an account in 1password on your phone so you can type in the password. Passkeys don't support this very basic and common workflow. Meanwhile there's no real security benefit over password manager generated complex and not reused passwords.
I use a passkey with discord on my phone. If I want to log in to discord on a computer it shows a QR code on the page/desktop app and I scan it with my phone to log in. I could see this become a pretty common pattern. I like it because I can use discord on even a pretty untrusted computer without providing it any credentials or access to my passkey, and then later when I'm done I can revoke the session.
now multiply it with every web site you want to access.