The thing that is a main driver to "climbing to higher positions" is usually desire and motivation, which is a cultural trait. Intelligence has a high correlation because there are plenty of motivated people across all levels of intelligence, so highly intelligent are better at succeeding at such well-defined problems.
Smartness is sometimes about well-educated or simply experienced and knowledgable. Eg. even if I was more intelligent, I'd trust a medical doctor because they have a vast knowledge and experience that I lack.
Still, the article makes a nice distinction between well- and poorly-defined problems. It's definitely going in the right direction, so go and have a read!