Not sure if the analogy holds. Human brains work on the same principle as lizard brais, no change in strategy was needed to go from lizard intelligence to human intelligence. I'm not saying that DL holds this promise though.
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https://en.wikipedia.org/wiki/Triune_brain
There are distinct architectures and our brains have additional architectural features that lizards' lack.
https://en.wikipedia.org/wiki/Basal_ganglia
Yes, but unlike a ladder and a rocket, they are not fundamentally different. This is why I don't think the analogy holds. Evolution iterated over the same model, never starting again from scratch.