No diminishing returns on complexity in the region of the transition to human intelligence: "We're so similar to chimps in brain design, and yet so much more powerful; the upward slope must be really steep."

Or *there is no curve* and it is a random landscape with software being very important...

Scalability of hardware: "Humans have only four times the brain volume of chimps - now imagine an AI suddenly acquiring a thousand times as much power."

Bottle nosed dolphins have twice the brain volume as normal dolphins (and comparable to our brain volume), yet aren't massively more powerful compared to them. Asian elephants have 5 times the weight...