https://www.sciencealert.com/the-eyes-maximum-resolution-is-even-higher-than-we-thought
"Their findings suggest that, at the distance between the sofa and TV in the average UK living room, the human eye cannot resolve all the pixels presented by ultra-high-def 4K or 8K TVs.
So these screens, it seems, don’t provide any noticeable benefits over a lower resolution 2K television of the same size (44 inches)."
…
"… it appears that TV design may have reached a point of diminishing returns, at least in terms of resolution.
Size-wise, bigger TVs will always be coveted. Yet the researchers hope that with these new insights, manufacturers will begin designing displays that meet the resolution capabilities of a higher proportion of people – say, 95 percent – rather than the previously assumed average observer."