As usual you keep spewing the same crap on this subject even though science has proven you wrong every time you spew this nonsense. Your eyes can see 720dpi/ppi at 1 foot away. This is why art is printed in 600 dpi or higher. I have told you this what? 4 times now? Yet you choose willful ignorance every time :/
If you cant tell the difference between 720p or 1080p or 1440p on a cell phone than you have serious issues.
https://techdissected.com/ask-ted/ask-ted-how-many-ppi-can-the-human-eye-see/
Actually yes they do because wait times cost us a huge amount of time and money.
https://jlelliotton.blogspot.com/p/the-economic-value-of-rapid-response.html
All I can say is lol and I guess you'll tell it for the 5th time because YOU don't get it. If you have to stare at the screen from 5cm for 10 seconds to spot a difference you're just proving my point. And no, my sight is perfectly good. Just because there is theoretical difference, that doesn't mean practical application makes any kind of god damn difference. And that was my point if you haven't get it yet. If you give bunch of 720p and 1080p phones to 100 people and 80 of them can't tell them apart without staring at pixels like absolute retards, then there's your problem.