I followed a different philosophy than most. I used technology as a teaching tool.
We went the same approach. DS7 learned the most from iPad by watching videos and playing educational iPad Apps. Besides Minecraft and educational Apps/programs, we don't download/buy other video games on the iPad or for the computer.
He's pretty good controlling the screen time on his own. He'll be on an subject on the iPad for a while and then he'll walk away and go drawing on paper, doing a few questions on the Brain Games book, playing the piano for a little bit (whatever he wants to play but pretty much never the piece he's supposed to practice) or listen to music and dance :-).
So I would say, as long as you control the screen time, using technology to learn is not a bad idea.
