Well that's, like, your OPINION, maaan...
Seriously tho, I generally disagree with this opinion. Games (even computer ones) grow a child's imagination, improve reflexes, help with problem solving... And loads more. I'm not giving them a tablet so they can be "Good at computers" when they grow up, I am doing so for all the other reasons ... and to distract them on long journeys!
I also never understood the "Read a book" thing. Apart from old people who don't know any better, why is this any better than a tablet?! Games are FAR better at stimulating imagination than any kids book I've ever read. I'm not saying books aren't important or good, I just don't understand why they are magically superior?!
For the record, we have 2 boxes of Lego, several shelves of books, and my daughter does taekwondo and ballet...
I just don't understand why tablets aren't considered more useful and educational...