I’m not entirely sure the consumer actually cares about the ‘premium’ design with XR from the X/XS series. Why? All of Apples phones are really well-made and it’s clear when you hold them. What I don’t understand in your post, how is the XR lacking premium design? The design is exactly the same as the XS with an all display, Face ID, aside from an LCD panel versus OLED (Aside from the stainless bands), I mentioned it before, hardware is superficial, and it only ‘Goes so far’, visually what the consumer see’s, is a refreshed iPhone, from what the previous design was from the iPhone 6 through 8.