Especially considering that we don’t even understand the model we’re seeking to reproduce or match. We still know very little about how the brain relates to the emergent process of a mind, and what little we do know indicates a ridiculous level of complexity. Just the fact that there are a number of different neurotransmitters which seem to be “interpreted” differently based of a number of variables we’re aware of is massively more complex than a set of binary switches however large. To achieve actual intelligence we may have to have a fundamentally different method of computing which we haven’t yet invented.