The "human perception" crap is always marketing. Everything is supposedly at the limit of human perception, until the next generation of technology comes out, and then this time it's for real at the limit of human perception! I think the last 20 years of tech products I've bought were always marketed as at the limits of human perception.

Step aside 8 bit color, 16 bit color displays are here: 65536 colors! Nobody can perceive more than that! Then 32 bit color came along: 1+MILLION colors!! How can it get better than that? Humans can't perceive more! 30FPS gaming as the gold standard for what the eye can behold, then it became 60FPS, now it's 120FPS! The PPI arms race is the same thing.