Passkeys reduce complexity, at least in my experience. A single click versus entering credentials then finding the 2FA pin on your phone or something.
https://community.bitwarden.com/t/special-vault-search-keywo...
Maybe it's just a Bitwarden issue.
The 2FA issue isn't such for me. As I explained in a different comment, 2FA pins are copied automatically and are thus just a "ctrl+v" away.
Having to pull my phone out or go and find/fetch it to grab a pin is pretty annoying for me, since I also don't keep them in my password manager.
I did for a long time but figured that if my password manager was compromised I would be royally screwed since they'd have my 2FA there to, meaning the password manager is actually a weak point.