Yep I do agree in a way - at least regarding the added security of 2FA.
I do just personally really like the idea of having everything in one place, which is my reason to suggest this kind of “midway solution”
I wouldn’t place my 2fa into bitwarden without this feature. Use of 2fa inside of bitwarden should be protected by a separate password – and bitwarden should encourage its use from a different device. In other words, when on your PC and trying to log into a website, you should use your bitwarden browser extension to fill in the password, then use the bitwarden on your phone to get the TOTP code! That way, if there is a keylogger on your PC, the worst they can do is get into your bitwarden password vault, but not the 2fa. (yes this requires some discipline on the user’s part, but bitwarden could strongly suggest this method within its interface somehow. At least provide a warning of some kind, because users, including myself never think of these things!)
Sidenote: I changed the title of this Feature Request from “Separate Password for 2FA (Verification Codes/TOTP/Authenticator Keys)” to “Separate password for access to the integrated authenticator (2FA TOTP codes / Authenticator Keys)”.