Consumer grade disk speeds have gone up a ton since 7200rpm disks with the introduction of SSD which makes a huge difference. Furthermore, while people aren't

Consumer grade disk speeds have gone up a ton since 7200rpm disks with the introduction of SSD which makes a huge difference. Furthermore, while people aren't really after bigger screens, getting to a point where a laptop or desktop has similar DPI to a smartphone would require vastly higher resolutions for which there isn't the technology yet.