Engineering CAD applications make use of the high pixel count monitors. Being able to look at details without zooming in & losing perspective is valuable. The monitor in your sheet is 2560x1600 or 4 mega pixels. Definitely chokes a horse running general computer class video.
Medical applications, graphic artists, and games can also show details lost in low resolution monitors.
Working backwards: if one does not want a continuous hour glass on the screen, lots of pixels requires huge video power which in turn demands fast CPU lots of memory and storage. All of which (especially video) consumes enough electric wattage to heat a small house.