

Because if you draw things with very few pixels it tends to look blocky and unrealistic because the universe like your mom has curves. The more pixels you use the more realistically we can represent both real and virtual pictures. Cambridge says people can see up to 94 PPD. This means that 4K monitors on your desk are trivially within the range that people can distinguish but its dubious that 8K TVs are useful. The more you know!
ooh burn