I cannot believe there is not a (huge) market for small, portable phones that you could put in your pocket without altering the way you sit.
There isn't a huge market for small portable phones because most people shelling out $500+ for a smart phone want to actually use it as a smart phone. They play games, watch shows and movies, read full novels, and browse the web. These are all experiences that are enhanced by having a larger screen. My wife upgraded to the iPhone 6s from her old phone (5s maybe?) and one of the first things she said about it was that the screen was small, despite it being considerably larger than her old phone.
I cannot understand how the "I want a small phone" crowd don't realize that they are in the minority.
Or, don't use the phone that much but like access to a decent browser and apps when we do need them.
I have a 4, but actually miss my ancient G2 with an actual keyboard. Damn you kids and your touch screens, you ruined everything!
I totally understand why some people want a small phone. But the "I mostly make calls and only occasionally need a browser/apps" is becoming a very niche market.
Nexus 5X: 147.0 x 72.6 x 7.9 mm ( Front face 10,672.2 sq mm)
The front face will be larger. The only way it is smaller is the reduction in thickness.
[EDIT] My mistake, thought you were talking about the Nexus 5