That's a general blanket statement as fact. I went 1800p on 13" laptops 3 years ago. That is as low as I will ever go. I also have a Samsung Tab S2 8.0 for reading and a Nexus 6 phone. My next 13" Ultrabook will be a 4k OLED. Nothing else contends.
I don't mind high dpi on my Android phone since Android handles high dpi well.
Eventually high dpi will catch up in Windows, and I'll be "forced" to accept the horror of a 4K OLED ;-)