My wife works with preschool children. One of the problems she sees is that children are neglected by giving them a tablet or phone to play. There is limited verbal communication. And, little is expected of them. By the time they arrive in her classroom at age 3, they are non-verbal, not potty trained, and don't know how to interact with others. Obviously, some children have deeper problems that can be diagnosed and treated. But, many of them only need a little bit of attention and interaction to learn to speak and care for themselves.
It is becoming more common here too. My daughter is 6 now and a lot of the kids in her age group can't do half the things she can. She doesn't have a phone or tablet and has very limited TV time. I see kids in prams shopping trolleys just staring at screens - easy for the parents...