Face ID Not Working [Fixed. Please see the approved answer for details.]

I sympathize with what’s being posted here as I had decided to stay with 1P 7 long ago and am not having issues. But I keep seeing posts about resetting the phone as triggering the issue. I am really curious why so many people have reset their phones. I’ve only done a reset network settings on my phone years ago because of some issue with my cell connection at the time, I don’t really remember what it was since it’s been so long. Other than that and having had almost every iphone produced, including my current 14PM, there’s never been a need to do this. Whats going on to cause all these resets?