Seems like a terrible implementaton.
Passkeys seem like someone was thinking really hard that 'passwords are kind of bad' (which is true) and 'what can we do to replace them?' and came up with something even worse after spending like a weekend thinking about it.
I keep getting pestered to use passkeys now, which is very annoying, but guess what? My desktop, very deliberately, has no biometric pass information. I have no cameras or fingerprint readers on it. And am I really going to haul my phone out separately every f@#$ing time I want to log into a website? No, I am not. Do I want to be completely locked out of my critical websites when my phone is lost? No, I do not.
So for me, who has relatively decent password hygiene (keepass with password + deceptively named keyfile), and keypass is moderately convenient for filling things in, this seems like several steps backwards in every way.