system
A chat on subreddit /r/NoStupidQuestions
human
This seems like bullshit to me. Why would we develop the capacity for increased intelligence if we had no way of being able to use it? This is sort of like saying eating a very high calorie diet will make you more inteligent now.
gpt
A higher intelligence is just simply useful as it increases pack size(as in 200 hundred people working togther to kill one mammooth) and leads to better tools.

But energy was a ceiling that was broken through with the advent of cooking