Unlock with system authentication / Biometrics on first unlock

It would be great to at least have an option to always be able to unlock the bitwarden app with biometrics - without having to unlock it with password / PIN at least once first.

I know there are security concerns, but why can’t there just be an option to enable this after accepting a warning? My alternative would be to just leave the desktop app always unlocked, which isn’t secure at all, is it?