Regardless of the details of how a brain is a conscious, it can be reduced to its constituent pieces or nuts and bolts, so to speak. Everything from the electrochemical potentials within neurons to the encoded chemical information in the form of DNA and RNA that spontaneously replicates and orchestrates a maddening array of complexities, we can partially explain. Even if our explanation is basically parts in a bucket, that's enough to paint a future where humanity understands enough of those processes to replicate consciousness without actually understanding why it works. Perhaps we don't need to understand the emergent properties, but merely discover them like the standard model in physics. We equally can't explain /why/ the fundamental physics constants are the way they are, but we can use them to do extraordinary things.