Wrong answer, unless you enjoy being short-sighted with evolution in technology.
"This begs the question of why you would possibly need a 4K panel on your smartphone. The emergence of virtual reality (VR) is the major driving force. A 1080p or even a 2K screen might be fine for everyday use, but pop that phone into Google Cardboard or a Samsung Gear VR headset, and it becomes quite pixelated, since the resolution is split across two eyes. It’s called the screen door effect. For example, a 1080p screen becomes 960 x 1080 pixels in a VR unit. This might seem like enough, but don’t forget that the display appears much larger in a VR headset, thereby diluting the quality of the image.
Most people who try VR for the first time say how cool it is, but they almost always notice that the picture needs improvement. A 4K screen will play a big part in improving the experience by giving a 1920 x 2160 pixel resolution per eye."
VR might seem a gimmick when it comes to video games since we are still in the early days of it. But watching movies and TV shows could be the next big thing in a couple of years. VR can also even help plan your next vacation or go through some "simulated" experiences. Of course, Apple and their defenders, lack the foresight to imagine any of this. Always years too slow to adopt newer tech. Same ol', same ol'. Mmmkay.