Re: The original script had the machines using human brains as computing nodes, but the focus groups consisted of people too stupid to understand what they were talking about.

Here's what this original script says:

They discovered a new form of fusion. All that was required to initiate the reaction was a small electric charge. Throughout human history we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony.

- http://thematrixtruth.remoteviewinglight.com/html/original-matrix-script-13.html