FaceID while driving is challenging b/c my eyes are usually in the road. This is where TouchID had an advantage. I want to be able to jump in the car and put my phone in a mode that doesn’t require me to unlock my phone. Sure, there are ways to turnoff the auto lock, but you can’t do it through Siri, so there’s no quick way to do that. Auto lock is disabled when using an app like Waze, so I often drive around w/ Waze on, just so my phone won’t auto lock.
When FaceID doesn’t succeed, I always wonder whether I’m too close, or too far, or the camera is aimed wrong. It would be nice to get an onscreen guide on where my camera is targeting my face. It can give me some real-time cues to either tilt/turn the phone, move further away, or closer. If it’s just not my face, then i’ll know to look harder at the screen or take off my sunglasses.