So because desktop monitors have stagnated over the past decade, we must all be content with them?
And even if we assume desktop monitors are good enough, we use them at significantly greater distances than phones/tablets -- better than a desktop doesn't mean anything.
Yes. And, Mr. Jobs's lies notwithstanding, neither the iPhone 4 nor N900 is there yet. Every time I've seen someone do the math to justify the "retina display" tag, they slide from cycles/inch (where each cycle is a black/white line pair) to pixels/inch (where a pixel is either black or white, and you need two of them to make a cycle). Whether through incompetence or deception, that factor of two pushes the threshold of pixel-invisibility down somewhere around 600ppi, not 300ppi. And really, people (by which I mean me ) were arguing for better PPI before the iPhone 4 came out. With the N900, we did get a somewhat increased PPI, although rather than being used to increase pixel count or to put a d-pad next to the display, it was wasted to shrink the device from the perfectly usable size of the N810. That makes 800x480/4" a step backward, when we should be moving forward...