Bitwarden Authenticator is a standalone app that is available for everyone, even non-Bitwarden customers.
In its current release, Bitwarden Authenticator generates time-based one-time passwords (TOTP) for users who want to add an extra layer of 2FA security to their logins.
There is a comprehensive roadmap planned with additional functionality.
Available for iOS and Android
With unique passwords, the attack surface just changes. Instead of attacking the passwords, attackers attack the password managers. LastPass, Okta, and Passwordstate each had breaches, and the first two are quite popular.
That doesn’t mean Bitwarden is at risk (not sure if it has been targeted), it just means that attackers are finding success going after password managers, so they could go after Bitwarden. Maybe they’ll sneak in an xz-style bug that’ll allow attackers to steal credentials en-route, idk.
So it’s a matter of good/better/best:
The overhead from using a separate 2FA app is pretty low, just make sure it encrypts your keys and you trust it (FOSS is a good indicator of trust).