Why?
Children need to be able to play on their own, have an imagination and be able to think of things to do on their own.
You don't want a child that is dependant on the parent to play all the time, just like you don't want a child who is socially poor. There is a happy medium.
Older children yes, but at 10 months old a child will react better to human interaction than being left with some app.

Even with the child at achool. Afterschool club is over £100 a week from 3pm - 5pm per day