Yes, and there's things like feedback / reflection, self-modifying like behaviour, lossy memory, emotional state, tiredness, aging, loads of drugs & hormones to

Yes, and there's things like feedback / reflection, self-modifying like behaviour, lossy memory, emotional state, tiredness, aging, loads of drugs & hormones to influence the process, etc, etc. Buuuttt... it's possible that few if any of those things are needed to capture the essence of a brains' functionality. Maybe it's simply a matter of size. Maybe some configuration tweaks. Perhaps a different architecture. We simply don't know - yet.