The real factor is pixels per degree of your vision, not ppi. Viewing distance range with phones and laptops is pretty limited (an arm's length), but with a mon

The real factor is pixels per degree of your vision, not ppi. Viewing distance range with phones and laptops is pretty limited (an arm's length), but with a monitor you can simply move it farther away on the desk to increase the perceived pixel density. Of course, moving the monitor farther away also makes the perceived monitor size smaller. since PPI and distance can be traded one for the other, what ends up mattering is the total resolution. 4k is a lot of pixels.