Comment Upscaling. (Score 1) 92
The more raw pixels your display device has, the better you can upscale lower resolution video onto it. For example, if I watch 720p video on a 1080p display, it has to do a 3:2 upscaling and that means that half the scan lines fall in the cracks and cannot be represented adequately. If I'm using a 2160p display, that's a 3:1 upscaling and every third line can correspond to exactly what was fed in. Thin lines won't disappear, and text will remain legible no matter what size it was in the original image. I could also use Nearest Neighbor scaling and get every pixel replicated 9 times over, but it would remain faithful. Similarly, if I feed in a 480p signal from a retro game rig, higher resolution at the screen level means I have more options on how to best emulate a CRT without having to worry about pixel boundaries on the output end.
I want an 8K display in the range of 50 inches so that I have the choice of sitting two feet away and using it as a monitor, or sitting across the room where I admittedly won't care if it's upscaling 1080p video. I don't want to have to own two separate devices to do these jobs, even if the resolution is overkill much of the time. Right now, I use a 27 inch 4K display as my primary monitor but there are times when I really could use two or even four of them. Do I need an 8K TV? No, I realistically don't even need a 4K TV. 1080p is fine there. But that's not the only thing I would want to use a large display for. I don't have room for a dedicated movie watching screen if I've got a 55 inch monitor mounted to a wall, the one device has to do double duty and that means sometimes it's going to be severe overkill for the purpose.