User blog comment:The Milkman/No Love For Leviathan?/@comment-4947725-20120918053701/@comment-24174486-20120920044309

"Why are the Reapers getting involved when Organics pretty much have this covered?"

The Reapers wanted the geth to serve as their pawns and agents, assisting them in the harvest and ultimately replacing the keepers after the Protheans' tampering with them.

"I'm saying that Mass Effect 3 introduced a brand new goal."

The Catalyst introduces a new viewpoint, and it is up to the player to decide if they wish to give it any weight. It is just like arguing that you're meant to resolve the "conflict" of the Illusive Man's goals of elevating humanity above the other races as well.