> I’ve never met a person saying he hates books and wishes they were white on black.
Books don't emit light. They reflect it. That's the difference.
I think that reinforces their point if anything. With reflected light, you have a natural, inherent form of auto-brightness because the amount of light coming off the page depends on the amount of light in the room.
The retina can't tell the difference between reflected light and emitted light
It doesn’t matter what the source is (unless you have crt days flicker, bad tn panel polarization or what have you).
Irritation comes from the difference in brightness.