Yeah, there's room for improvement at every level, but your specific example: How do you get more and more difficult tasks where you can steer the training? To me, that seems limited by how creative humans can be. How do you get past AGI and into ASI with that? If the AIs make the tasks, how could we encourage them to be useful? Maybe you could push for harder and harder math proofs, but other than that I'm not sure.

Anyways, I'd be thrilled to see exponential (or faster) growth. Bring on the Culture, Accelerando, whatever. I just don't see it yet.