If I wanted to raise my kids to be good with computers, I'd give them machines from the 80s.

For a start, you can program them. (My smartphones make me sad for this reason.) Further, you have to program them to get them to do much of anything. To play a game, you have to type it in! Which means you can type in something different, and make your own games! They always come with a manual. And they are beyond the reach of the tentacles of the attention harvesting monster.