I was slightly confused with Apple’s logic in allowing this on the iPhone X, XS and XS Max, and yet they’ve left out the iPhone XR. Luckily I only use my XR as a backup for my iPhone 12, but still, this is very strange.
The only differences between the XR and the X, XS and XS Max is that the pixel density on the X, XS and XS Max are both 458ppi, and have HDR, whereas the XR is only 326 ppi with no HDR, so that is probably the reason.
I’ve just looked at the spec for the iPhone 11, and it would seem the same reason exists for this against the 11 Pro and 11 Pro Max.
So that has to be the reason!