There are other types of acuity, such as vernier acuity, that are much more accurate. If you had a "human sized" display (let's say 2m x 2m), that you could st

There are other types of acuity, such as vernier acuity, that are much more accurate. If you had a "human sized" display (let's say 2m x 2m), that you could stand next to, and it showed footage of a real size analog caliper that you had to read, I wouldn't be surprised if you needed something like 128K video or more. But I agree that for regular video content, 8K is good enough.