I agree for small screens -- reading anything on my laptop is painful -- but reading on a 32"-40" 4K screen, where you can have two pages shown in full at a larger-than-life size, makes a huge difference. I still prefer paper overall, but I no longer mind digital.

You could get close to this by just using multiple PDFs. However, no one seems to do this (@haskellbook is the only exception I can think of), so perhaps editors feel it's not worth the extra time and effort.