I think it’s a fool’s errand to deny the screen is lower specs than it should be give the competitors offerings but it may not matter from a practical usage standpoint. Resolution is only part of the picture when it comes to screeen quality. Color gamut, for example, May be much more important once a minmun resolution is achieved. I don’t if the XR reaches that point but the hands on videos have been extremely positive about the screen (at least those commenting on in person viewing not those just commenting on specs).
In my opinion, iPhone LCDs have always been more pleasing to look at that much of the competition. So if the specs are worse, but it looks better - who cares?
Of another note, Samsung’s (and Apple’s) OLED display (not sure about other manufacturers) are pentile v RGB displays and technically only have enough red/blue sub-pixels to resolve about 1/2-2/3 of the advertised resolution. The advertised resolution is up scal, essentially, by overpopulating green sub pixels in each pixel. So a 2k OLED display is really just a 2k equivalents display. That said, the actual resolution may still be higher than the XR so the distinction is irrelevant.
This is a good write up on Pentile:
https://www.reddit.com/r/GalaxyS8/comments/695l1g/basics_on_pentile_amoled_displays_the_real_reason/
One thing the write-up does a good job demonstrating is how irrelevant it is to judge a display by paper specifications. If something looks like the best or one of the best screens you have seen - who cares what the actual specs are. There is certainly some other magic picking up the slack.