Originally Posted by StSebastian
I think the rule really stays in place for a different reason. Back in the day I'm sure the electronic equipment gave off a lot more interference, but these days it's to make sure people are paying attention in case of emergency during takeoff. If people are busy listening to their music players, then they're not properly watching if there's irregular operations during the takeoff or landing.
This is what I've always thought the reason was also. To make sure all pax are attentive during the vital climb and descent.