Agreed. As a child, I read up on technology/computers as well as history (still a big hobby of mine), archeology, and random subjects found in the encyclopedias my parents bought me. I went through a bunch of phases (dinosaurs, Egyptian history, computer stuff, art, taking care of fish, etc.). My parents supported all of these with books and museums trips.

I understand the appeal of introducing your child to your passion, particularly if it's an employable skill, but IMO at 7 years old... just buy them whatever books or encyclopedias for children they find interesting. It's not going to hurt them! Though definitely share technology with them.