You're right. Sometimes I get tired of typing my sudo passwords and wish there was a faster way. Biometrics are not bad.

It really depends on the way biometrics are implemented. If you're doing it Apple style, where a dedicated chip validates biometrics and uses encryption and signatures to prove to the OS that the user is who the say they are, they're as good and trustworthy as the software you're running on them (which in the case of macOS for instance requires full trust).

If you're doing the "fingerprints implemented as a webcam" or software based facial recognition from a shitty webcam, you're risking quick and easy bypasses. Still good enough for a computer you leave at home (as long as you don't need to protect yourself against shady law enforcement) but definitely not that secure.

From what I've been able to gather online, nobody but Apple and phone manufactures seem to care much about actually doing biometrics securely, including the biometrics hardware companies. It's such a shame because it's definitely possible to do better.