Sure and certain things are impossible to do unless you’re extremely strong. So what? Pure intelligence, like strength, is generally not the limiting factor
Yep, in many situations intelligence beyond a certain threshold isn't the limiting factor. That's the qualifier missing from the first comment that I addressed. In some situations (that HN members may be disproportionately interested in), it is and it matters.
If you care about being "happy"? Sure.
But plenty of things require a bit more than "a surprisingly low threshold". You're not going to be Jeff Dean (for example) if you're just "smart".