In your opinion.What is getting annoying is that you keep saying this but don't quantify it at all. You just keep hiding behind "hey its my opinion" as if anyone cares more/less/differently because it is your opinion.
Truth be told there are no opinions. There is right, and everyone else who thinks they're right.
In the case of iPhone XR, there is a right answer too. The right answer is that it should have exactly the kind of display that meets or exceeds the expectations of the intended user, while also meeting all of the engineering, design, manufacturing, and cost requirements.
So to just flippantly say "it should have a 1080p screen" is as nonsensical and uninteresting as it gets.