My question to you is: have you used Face ID? What makes you prefer a fingerprint reader on the back to it?
I can unlock the phone as I take it out of my pocket. It's unlocked before I even look at it. I have not used Face ID.
I have a phone with the reader on the back. Seemed like a good idea til I realized I couldn't unlock it anymore while pinching it out of my pocket much less when it's flat against a table.
In fact it feels like a hilarious oversight.
> I couldn't unlock it anymore while pinching it out of my pocket
I don't have that problem. Maybe if I wore skinny jeans. Unlock from pocket is the way I usually do it.