Wolfing food that's barely tasted while glued to a screen is isolating, habit forming, and probably no good for your digestion either.
That is not what is being talked about here - although obviously people do, do this (and have done since there was a TV in every home) - and I am not saying that woofing food down whislt watching tv or watching an ipad in a restaurant is a good thing, it isn't, and sitting with your family and eating and interacting is something that should be encouraged (apart from when it is eating pizza in front of a film with the kids - this is one of life's great pleasures!)
What gets me is that judginess over the appearance of any screen at the table. So, as an example, we go out for a meal with all 3 dcs, we sit down, ds has his talker out, we look at our menus, make our choices, the dcs do their colouring in, or play the games on their menus, we chat, we play a game. The food arrives, we eat and chat. Ds doesn't eat much, maybe a piece of garlic bread, and his drink, he wants his ice cream now. I explain that we will wait until everyone has finished and have our ice cream together, as he is getting cross and bored of waiting, and we are eating, we let him play his ipad, so he puts his headphones on and plays a game on the ipad. Everyone has finished so we get icecream - the ipad goes away - it might come out later, or it might not - but if you looked over, you would just think, 'oh well, there is the end if communication and interaction as we know it, look at that little boy staring open mouthed at his screen...such a shame..' etc
What the op and a few others are describing, is a screen coming out for a bit of the time you are in a restaurant, not everyone sat in stony silence, staring at their individual screens shovelling food in their mouth holes.