How do you explain from classifications?
I mean, there are literally no explanations in Model A, functions, types, quadras, Reinin dichotomies... they're all classifications.
When people were busy classifying all the different species into taxonomies in biology, they were quite confused and overwhelmed and thought that they could never make sense out of it all. But the theory of evolution was so succinctly simple and elegant that it could actually explain and make sense out it all. It even explained things outside of biology, which makes it an even more objective and universal explanation.
There's no real such thing as fundamentally different "structural differences" in computers, as all computers are based on elementary mathematical and logical principles, or the Turing principle. And since the computer can compute anything that the physical object can possibly compute (that's the theory), the brain is no different.
So what I mean is, the brain is the hardware, and everything that's running in it is the software. Things like consciousness, emotions are all software. So it looks like nature has been the programmer of our brain, programming things into our brain via evolution.