User blog comment:Ygrain/EDI and the geth: their purpose in the story?/@comment-70.143.64.65-20120724065141/@comment-4950455-20120724071203

The Catalyst is certainly not automatically right about its arguments, but the narrative structuring of its arguments very strongly suggest that they are intended to represent a major theme. It's not just a matter of detailing why the Reapers were created - the final choices are all framed in terms of synthetic-organic conflict, and while Shepard can implicitly reject those terms by choosing endings other then Synthesis, s/he is not allowed to explicitly do so.