well, for my case, I can't really tell a big different.
My daily driver is iPhone 8 Plus, and I don't own a XR.
Just to get the idea of how "bad" a 326 ppi XR, I borrowed my friend's XR for a comparison.
TBH, I cant actually spot any major different between these two, only very slightly blur on the icon of the clock at the home screen, where XR's clock hands slightly bold than 8 Plus. Probably I am getting old and my eyesight is not that good anymore.

For comparison, I have another phone, which is Honor Play with 1080p FHD+ screen, and it can be turn down to 720p HD+ for better battery consumption. I try to spot different of two resolutions, cannot actually tell who is who. Only can tell when taking screenshot, then FHD+ resolution is clearer than HD+ when zoom in.

Anyway, still maybe I am getting old 

Same here. I went from 8 Plus to X to XS Max and to XR. Can’t spot any difference with the naked eye except the blacks are deeper with the OLED displays. I must be getting old too.

Walk-in and get 2 unit 64gb from machines klcc at 12.30 just now

Get another unit for my wife as she upgrading from iPhone 6S to iPhone 11 white 128GB. 😁

Encounter an issued where old phone unable to migrated to new iPhone.
Probably due to iOS 11 in old phone so updated to new version iOS 13.

And same thing happened, we can’t migrate also, anyone encounter before??

FYI, no backup to iCloud since 2016 year from old phone and no any update for apps as well.
I was thinking is it because of those issues cause cannot migrate data to new iPhone ??