Wow, it has a lot of unexpected downsides.
I've a lot of unexpected behavior from the faceid thing. Lots of unexpected swipe-ups that drop me out of an app and put me on the home screen. Can't unlock in the dark, too close to your face, off to the side, in your pocket. Lots of "I saw your face an unlocked" that I didn't know had happened.
fingerprint sensor unlocked when you wanted it to, with haptics. switching apps was a button operation, not happening when you didn't expect it.
It makes one look completely like a tool to pull out their iPhone and stare at it for ten seconds while checking out with a cashier. Deeply embarrassing and very annoying.
These new Gemini shill-agents are not very compelling.
(I also wish for smaller screens and no-adhesive battery swaps though, neither of which seems likely to happen.)