Legibility follows an exponential curve. The improvement will be noticeable up to smartphone densities (~220 dpi). After that, I don't think text can get any be

Legibility follows an exponential curve. The improvement will be noticeable up to smartphone densities (~220 dpi). After that, I don't think text can get any better. I won't be upgrading to 8K (384 dpi) anytime soon, but I have no intention to go back to 1080p even if they tend to have better refresh rates and are much cheaper.