I guess that I am saying is that I'm not convinced that the direction we have been heading is the direction that will ultimately produce the end result we want. The model T and the present day automobile share the same basic concepts. I'm wondering if human-level AI will bear any real resemblance to today's solutions on the concept level. I'm not convinced it will.
I think the argument is that we can already simulate a single neuron fairly accurately today, and so some decades from now we'll likely be able to simulate them all, plus their interconnects, and thus by pure brute force we'll get a human-level AI.