I feel like pointing out that stadiums and airports are single buildings that in the grand scheme of things aren't nearly as common or large as a country's (or even a single state's) worth of power plants, highways/rail networks, or housing for the masses.

Airports can be complex, and of course chip fabs are an overwhelming case of quality over quantity, so in conclusion you're definitely right on the "hard" count still being accomplished, but I notice a particular gap missing here on "big".