Possibility for 2FA login always on
I have Yubikey because every time you log on to Bitwarden, you should have it, and without it you wouldn’t be able to get into storage. But Bitwarden can be accessed with just a password or just a pin code if the store is only locked. I don’t know why it couldn’t make sense to ask Yubikey even after a PIN, even if Bitwarden is locked, but from my point of view it would make harder for a outsider to login to my Bitwarden.
For example, if my phone is stolen and someone gains access to my Bitwarden (somehow knows my PIN), that person would not be able to open Bitwarden, if he/she doesn’t have my Yubikey.
Maybe I could set 2FA always on for certain devices, like mobile phone or laptop, and leave it off for other workstations.