When, as a kid, I first took an interest in computers, 300dpi laser printers were all the rage. Now they boast around 2400dpi. No one seems to complain that images and text are sharper. Now displays and the printed page may be different but one certainly doesn't generally hold a piece of paper 2 feet away to read a book.
Displays and the printed page are too different to compare - so why bring it up? If anything, you just provided another example that agrees with the GP's post. At 300dpi, laser printers print almost perfect text and increasing to 2400dpi does almost nothing for plain text. If it was not for printing graphics, the increase would be pointless.
When it comes to high resolution displays, so long as they continue to use more power then the lower resolution models, users will complain. When additional GPU hardware is required with no visible improvement - users will again complain.
They say engineering is the art of compromise. High resolution displays require one to compromise on battery life and purchase price (GPU) so there is a limit as to what is practical. At a certain point the higher resolution becomes nothing more then a marketing gimmick.