But fitting in a pocket is a pretty huge feature. If it doesn't fit in my pocket, I cann't carry it around, and if I can't carry it around, I won't buy it.

An iPhone 7 is already tall enough to stick out of some rear pockets. And the width is pretty close to the max that will fit. I'm a 5'7" male, 30" waist, wearing average cut/fit pants (not skinny jeans).