The Pixel 4 series only uses face unlock for biometric authentication; it is that secure. Or is it? Well, a video of one device unlocking to closed eyes suggests otherwise, as does the possibility of someone who merely looks "a lot like you" authenticating payments with your face data. Is the face unlock on the Pixel 4 series not so secure after all?
https://www.notebookcheck.net/Google-warns-that-the-Pixel-4-can-be-unlocked-with-your-eyes-closed-perhaps-even-by-someone-who-just-looks-like-you-too.439524.0.html
Doesn't make sense if it unlocks if you look at it...but also unlock with your eyes closed, in which case it shouldn't matter whether or not you're looking at it.
This just doesn't seem any more safer than FaceID since it's proven that twins could unlock FaceID, it was even found that people who don't look a lot like each other could sometimes unlock FaceID, then there's that face mold from that Vietnamese security company...