My opinion on this topic, while perhaps not as strong as yours, is similar.

I think we inadvertantly created a similar dependence in our daughter, albeit with books rather than electronics.

She is 10 now and, aside from some exposure at school, she has never been allowed personal use of computers and the various computer-like devices we have today.

We did reading curriculum at home between 4 and 5. By 6 she was reading on her own for pleasure.

Today the child walks from room to room in the house with a book. Car rides without a book are accompanied with groans and anger. Any situation where boredom could set in is much worse if she doesn't have a book. She has to be specifically prodded not to read in order to get ready for school, etc, in a timely fashion.

I don't wish we'd done anything differently, but when she does eventually have access to electronics I fear she is going to transfer her extreme book "dependency" to electronics easily.