I'm going to disagree with the prevailing wisdom here. The iPhone is NOT getting more expensive. What has changed is that Apple now offers current-tech and future-tech at the same time. They didn't used to do that.
The baseline iPhone has roughly been around $600-$700 since the beginning. And the XR is $750. Ok, so that's $50 to $100 for inflation over a decade. NOT BAD
But you're not counting that one. You're looking at the XS as the "real" iPhone and saying the XR is a compromise. Ok, that's great that you feel that way, but you're wrong. Apple couldn't make enough OLED screens to only sell XS phones. The factories just don't have that much capacity yet. Those are not 'today's iPhone.' They are future phones that Apple is selling early. And the higher prices are helpful here because Apple literally couldn't make enough if everyone decided to buy that model.
So, no, the XS isn't "normal" and the XR "budget." You're all wrong. The XR is the phone we should be getting in 2018. The XS is future tech, early, at a higher price. And isn't it great that you live in a world where you get that option?
For anyone about to say that I'm wrong, ask yourself this: The iPhone 5C was a budget phone designed to keep down prices: An old case with good-but-not-quite modern internals. Do you really not see the difference between the 5C and the XR? They are not the same plan at all.
Samsung has been making OLED screens for years. A lot of the Xs screen are made by Samsung and identical to the Galaxy S and Note screens