I meant hardware in the same sense as you. My point was that even if we assume the brain (borrowing your metaphor) makes no mistakes, introducing it does not r

I meant hardware in the same sense as you. My point was that even if we assume the brain (borrowing your metaphor) makes no mistakes, introducing it does not reduce the amount of physical breakage and jammage that is likely to occur. You're not choosing hardware over software, here - in which case I might choose differently - you're choosing to eliminate an entire link in the chain. That's always going to be a win for reliability.