Not a judgement at all, but in the rocks paper scissors game of life, the iPad will always trump the book if the kids are given the option.
In our house the iPad and iMac are fairly strictly rationed. YouTube is never self directed, only family AirPlay time, like watching SpaceX launches and stuff like that.
The books just have to be put down at mealtimes. Sometimes I catch them reading under the table and pretend to be angry about it, but they’ve got me allll figured out, (and I love it).
But there are just so many amazing books to read out there and I think we are so hard-wired for story telling, just make reading a cherished daily activity, and the moment will come at some point from 5-7.
The e-reader app is not that addictive. Maybe you meant giving a kid unfettered access? That's a completely different issue and has parallels in many forms of entertainment. But you shouldn't call giving a kid a smartphone/tablet as disturbing on its face.
It is balancing act.
And one more point. Maybe I'm wrong, but AFAIR child inclination to read is created from early childhood, so parents should show their reading enthusiasm to 1-2 years old child and older. Showing enthusiasm is not like "let me read to you", its like "of course I would play with you, but let me finish my book first". Reading to a child is also good, but it is not enough, because it shows behaviour "to read to a child", not "to read an interesting book for pleasure of reading" and not "to prefer book over video game".
I think if you just gave them the tablet and walked away, they might not look for anything else ... but that's true of any human of any age, it seems.
Of course it’s each parents prerogative, but I would never trade the beaten up pile of Gerald and Piggy for an app in a million years.
That one I haven’t seen.