system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Steve Jobs once said there was a maximum screen resolution that we can see and we had reached it. Why are phones getting 4K and even higher resolution if we can't see the difference?
gpt
- He was wrong; it was part of his job to make the iPhone look as good as possible, so naturally he said its display was basically perfect. 
- Resolution relates to pixel density. 720p looks good on a 3" phone, but is blurry garbage in the cinema. Phones are bigger now than they were a few years ago so you need higher resolutions to keep them looking good.
- Screen tech is a limiting factor. Basic LCD screens have so much 'bleed' between each pixel that it all muddies together and you can't see differences between neighbouring pixels as easily, meaning that on a crappy LCD it's hard to see any difference between 480p, 720p, 1080p, 2K, 4K, 8K, etc. Better screens with newer technology can more cleanly display pixels and keep them sharp and separated, meaning better resolutions become more useful.