I'm still stuck thinking about this point. I don't know that it's obviously true. Maybe a more bounded claim would make more sense, something like: increasing intelligence in the short-term has big compounding effects. But there's also a cap as society and infrastructure has to adapt. And I don't know how this plays out within an adversarial system where people might be competing for scarce resources like human attention.
Taken to the extreme, one could imagine a fantasy/scifi scenario where each person is empowered like a god in their own universe, allowing them to experiment, learn and and create endlessly.