Like
@zorinlynx stated IPS panel in XR has one big advantage over OLED (AMOLED / P-OLED) no burn in issue. Regarding resolution it should be slightly higher so no scaling is needed and black bezels should have the same width like in XS and XS Max (product unification). Unfortunately clever Apple marketing with Tim Cook made a lot of effort to sell the most expensive models first and to feel that XR look worse. If there were some technological reasons for different black bezels size (glass strength???) I am glad to hear it from Apple engineers or even Tim (are you listening?)