Does anyone have an idea why we didn't see any dark mode books while dark mode turned out to be quite popular for screens? Historically, printing black text on

Does anyone have an idea why we didn't see any dark mode books while dark mode turned out to be quite popular for screens? Historically, printing black text on white paper was presumably technically easier or cheaper, but I doubt this makes much difference for modern printing of the last fifty years or so. Edit: Thinking about it, it's clear that dark mode is most pleasant in dark environments, because it reduces the contrast between the screen and the environment. However, books, being reflective rather than emissive, don't work in dark environments at all. Which defeats the main use case of dark mode. Moreover, since books are reflective, there is no risk that they get brighter than the environment, while this risk exists with light mode on screens with a brightness level set too high.