I think it has to be the social part, not the electronics per se. When I was a tween, we had mostly non-networked PCs and games (e.g. Atari, NES). We played on them plenty, to be sure, but I still spent most of my time with friends outdoors. Today it seems like most games have a social aspect to them, and right along with reading/replying to comments on places like HN, it's the feeling of connectedness that is addicting. Electronics is how, not the why. In my opinion :)
This was more about getting through something that took longer than 30 minutes to read. I knew he’d love it, he just wouldn’t see it through.
Removing electronics til it was done just made it a non-optional task.
Because of that, and from what gradeschool friends have said, I've always been of the opinion that reading is too often introduced to kids the wrong way, through textbooks or very dry non-fiction, instead of through topics they'd actually find interesting.
[0] https://en.wikipedia.org/wiki/The_Forgotten_(Applegate_novel...
After he finished it, he loved it. He’s on book 3 now, reads every night because he wants to, makes a point to take the books with him, takes the accelerated reader tests for them at school (and aces them).
Now the kid loves reading... :)