> Asking why smart people aren't happier is a bit like asking why people who can jump high aren't more empathetic. There's no direct link between the two, you have to dip out to the material conditions.

I think the reason to expect a correlation is simple: Intelligence should produce a better ability to recognize patterns and identify the most useful ones. In a chaotic world, the things that can lead to a desired outcome are not always clear. It takes time and reasoning to cut through the noise and figure out how to get things done. There is absolutely a reason to suspect that reasoning faster and abstractly would make this easier, and thus produce more overall rewards.

Anytime intelligence is not associated with something, I interpret that to mean the topic is likely not a "hard" min/max problem.

Turns out, most of the human aspect of life is not a hard min/max problem.

Most human aspect of life is dealing with other people.

That definitely is not min/max problem.