Dude, why you have to do that? I don't disrespect you, even though I disagree with you, but for some strange reasone you behave like a jerk when you cant find any arguments that can support your beliefs. Visual accuity measurments are based on real science dude, and obviously ophthalmologists know much better than everybody else how much details human eyesight can see from any particular distance. You want to tell me, that you have more knowledge about eysight than real experts (ophthalmologists)?
Try to find the distance from your 4K display at which you can see the pixel structure. If you have 20/20 vision you will find that visual accuity distance measurements (unsurprisingly) are correct.
I have explained to you why people can see a big difference between 1080p/1440p vs 4K, because it's true that higher resolution improves the image quality, so I'm not denying that. All what I'm saying is this improvement has more to do with much supperior picture quality, not pixel density alone like you think. Dude, try playing some blurry TAA game like RDR2 on 1920x1080p display at native 1080p + TAA, and then play it at 4K downscaled to 1080p on the same monitor. You will see INSANE improvement in fine details, edges will look sharper, there will be less shimmering and pixel crowling, and all of that despite exactly the same pixel density. Only people who sit close to some big ass 4K tv (and use it as monitor) will really see benefits from 4K pixel density, bust most people either use much smaller monitors, or view it (sit) from much longer distance, so for most of us 4K displays arent even needed, so please dont suggest people have problems with their eyesight if they cant see the difference. Dude, I watch my 55'inch 4K TV from around 3 metres distance, so for me it's totally impossible to see pixel structure at this point, therefore I'm not benefiting from having 4K display. I bought 4K tv only because tv manufactures no longer make good 1080p panel displays, or not to mention 1440p.