Comment Never had LEGO (Score 3, Interesting) 425
Anyway, the thing about the Erector Set was that it not only exercised your imagination, as does LEGO, but it also exercised your manual dexterity, which LEGO does not. When you have to use little nuts and bolts to put things together you get good at manipulating small parts, which is excellent for improving hand-eye coordination, improving delicacy of touch and learning patience.
If you make things too easy for kids how are they to learn?