https://www.youtube.com/watch?v=dL9U6n4IixQ
I did some experimenting on my computer by playing video games and videos at resolutions from 720P up to 5K. With my eyesight, which is about 20/30, on a 27-inch screen, I could not tell a difference between 1080P and higher. We are talking about levels of detail that are hard to perceive. I personally like 1440P, not that it was really an improvement over 1080P. It is maybe for me more psychological that I think that 1440P is better.
Even if you have 20/20 vision and a 60-inch screen, you are going to be sitting further back, whereas I sit very close to my 27-inch screen. Can people really tell a difference with 4K on a big-screen TV?
Many years ago somebody made a video about how 4K was unnecessary because the resolution of the human eye was not going to tell the difference. If it is unnecessary on a 55-inch TV, then it is probably unnecessary on a smartphone. I bought an iPhone 10R, which has a sub-1080P resolution, yet I never notice the resolution being too coarse.
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