Paper is just better than glowing screens for lots of perceptual tasks. No-flicker is better than flicker, too. Keep in mind that lots of our new mediums can be thought of as chaff in the way of reading the right good book.
Flicker?? Are you talking about CRT monitors still?
LCDs still flicker
There are a lot of LCDs that don't flicker, or ones that flicker at 40khz or other high frequencies which is imperceptibile to a human. There are databases on the internet if you want to get a flicker-free LCD screen or laptop.
LCD dimming often works by rapidly flickering the backlight, although there are now more flicker-free LCD displays on the market.