On my desktop I have a 27" 4k monitor (3840×2160) and I'm a bit intrigued on how this resolution is not enough for a 15.6" monitor, what do I miss here?
Number queens. Same people that have such advanced vision they can see the difference between 100 and 120 fps. After a certain point, even more if you're at a safe distance from the screen, more pixels don't make different to the naked eye. But you'll never convince number queens.