I don't think Warren Buffet is the last word on this.

The top of the IQ stratosphere is functionally unusual.

Set a room full of 130s on a hard problem. When they get stuck, adding more 130s won't help.

Throw a >160 into the room and see what happens.

>160s don't necessarily think they have it all figured out. But as long as they're functional - not always easy - their raw ability at certain tasks is qualitatively different to those closer the norm.

I've occasionally had dealings with these people. They really do understand things phenomenally quickly, and some of them can turn their insights into gold.