I don't know you or your background but I'm going to guess you may not be part of that younger generation (late high school, early college years) who was literally born with a computer in their crib and came into their teen years with with a smart phone in their hand.
I'm often reminded of the divide between them and my generation (born in the mid 70's) when I visit friends who have children that age, or even in public places where they hang out in groups. I virtually see each of them holding a smart phone, maybe not always using it but definitely at the ready no matter what the circumstances (middle of a conversation with a human being, shopping for clothes, driving, etc...).
Even if they don't look at it for more a moment as you say, it's always present and slowly but surely encroaching on real human interactions.
That generation will be entering the world of grown-ups very soon and your argument will rapidly be invalidated.