It's polarizing because even though it is an upgrade if you are coming from a 6 Plus or 6S Plus, the 7 Plus and 8 Plus are also upgrades that have less compromises. Yes, you gain what you've listed if you go for an XR, but if you opt for the cheaper 7 Plus or 8 Plus you get better zoom. As a parent that may have a bigger impact on you than larger screen real estate and a processor that is wasted on most apps anyway. There is no clear "got to have it" feature on the X-line like there was when Apple introduced TouchID.
I understand the XR doesn’t have dual cameras, but I took pictures with the XR of my family in portrait mode during the holidays and the results were terrific.
Also, Apple still sells the 7+ and 8+, so the customer can opt for them if they prefer Touch ID.