If I have to type in my master password or even the PIN I use to unlock Bitwarden every time I want to login to a site, I will NEVER transition to Passkeys if I can stay on passwords.
I suppose the only exception might be if a totally separate verification only PIN could be established (i.e., separate from the PIN used to unlock Bitwarden) AND this verification only PIN could be kept very short, like 2 or 3 letters in length.
Logging into my password manager is my verification. Having to verify for every login is something I’m not willing to tolerate.
So basically, from my point of view, this requirement within the domain of password managers will prevent the adoption of Passkeys. I can perhaps understand the requirement outside the use of a password manager.