If you've already got a password manager, what benefit do you get from passkeys?

Avoiding the risks of short, weak passwords? The risks of reusing passwords across sites? The inconvenience of remembering loads of passwords? The frustration of having to type passwords manually? The risk of getting phished or typing one site's password into a different site? Remembering and typing usernames? The password manager takes care of all that for you already.

And if your objective is to have a second factor just in case your password manager gets compromised? A physical button just in case someone takes over your mouse and keyboard? Or a credential stored in a secure element that's (somewhat) protected even if you use it on a compromised machine? Putting it in a password manager (or OS keyring) removes those advantages.

I've found the Bitwarden to be hit and miss. Some sites work fine with it, others don't work. I haven't debugged it enough to work out whether the problem is on the Bitwarden end or the website end or something else altogether. Given I'm wary of the benefits (or lack of) of passkeys I haven't really looked into it in depth as I have other 2FAs I can use instead.