I suppose it's different for younger kids, but Minecraft was very productive for me compared to many alternatives. I was playing as a teenager, though. I learned binary logic through the redstone system, server administration (and how to build computers) from server hosting. Met some friends that I've kept for over 10 years and still see in person when we're in the same area.
It's a pretty wholesome game with a lot of skills you can learn without even realizing.
It's a pretty wholesome game with a lot of skills you can learn without even realizing.