I don't think it's so much screens themselves, but the way they are used. New research actually suggests touch screens might improve focus in toddlers. https://www.bath.ac.uk/announcements/toddlers-who-use-touchs...

New media has always met with resistance. Books were once considered poisonous trash. Now they're seen as healthy and educational. "In Plato’s dialogue, the Phaedrus, written in 360 BCE, Socrates warned that reliance on the written word would weaken individuals’ memory, and remove from them the responsibility of rememberin" https://aeon.co/essays/contagion-poison-trigger-books-have-a...