User blog comment:Lancer1289/All Good Things Must Come to an End/@comment-24174486-20130221183139/@comment-24174486-20130221194014

Are any of those things vital to the plot? Is Javik and his revelations about the Prothean empire vital to the story? Is knowing the creator of the Catalyst vital to the story? No, they aren't; you can play and understand the story of the game perfectly well without them.

"What did making it dlc accomplish that being part of the main game couldn't do?"

Length and depth, perhaps?