@Alphabetica my dd1 can sit nicely in a restaurant too, chatting to us or colouring. But sometimes she might also like to watch her favourite cartoon whilst we finish our meal or deal with her little sister.
She doesn't demand it as soon as we walk into a restaurant, sometimes she doesn't ask for it at all, sometimes it's offered to her as she has sat still at the table, eaten her food and been very well behaved.
I honestly don't understand this perspective that it's an either/or situation. Just like TV or any interactive toy, time using it can beneficial if used right.
Sometimes I will ask her if she'd like her iPad for the car and she'll say no, she'd prefer to take a different toy.
My best friend severely restricted her DD's tv use and she became obsessed with it, sitting staring intently when it was on, asking as soon as she walked in a room with a tv if she could watch it.
On the flip side, we've always had tv on in the background and my dd will sometimes sit to watch a certain programme, but will also continue to play with her toys in the same room without giving the tv a second glance. It's all just about balance