Lex is conflating a lot here erroneously. Intelligence is not perfectly determinant but it does correlate with "success" at navigating a complex world. Everything is systems, and you're ability to interact and exploit all systems determines the available resources to dispose. Some people are taller than others, some are more attractive, do better at sports and so forth. No one is saying the differences in attributes reduces the value of a life or the limit of ones possibility at happiness. To feel pain at this reality is to be a child. Life is unfair but we do the best we can with what we've got. All of this aside, it's wisdom that is the greatest of assets, which isn't attributable to intelligence, but rather structure of thought, belief and understanding.