It takes a day or 2 and you are used to the lower resolution again. It's not that the visible pixels would hinder readability. It's all psychological: Those who feel that nice looking fonts are important will be hard to convince. Probably also a status symbol for some. I prefer longer battery life and generally hate products and vendors wasting resources. I got HiDPI on my work laptop, but would switch back to a lower resolution any day. Use it regularly in other setups.