Still, the topic isn't strictly on people's interactions with a screen. The biggest difference is availability. You couldn't carry your T.V. with you everywhere you go, and it can't do even close to as much as a mobile phone can.

I'll agree that there's imperfect information because of how new the technology is, and how it's difficult to study the long-term effects because of that. However, erring on the side of caution while doing something as non-deterministic as raising a child because you don't know the consequences is not an incorrect course of action.