User blog comment:Markurion/How many of you put a bullet in Godchild in EC?/@comment-4947725-20120722033213/@comment-4950455-20120723200307

Blowing the relay would be pretty useless, given that the Reapers, if unable to prevent it, could just run away (as the allied fleet presumably would). It might take out the Citadel, although given that we still have no idea how they moved it, it's impossible to be sure. And even if it did, I'm not sure how much of an effect it would even have - after the Extended Cut, I get the impression that the Catalyst means it literally when it calls itself the "collective consciousness of the Reapers". The Citadel lets it manifest, but does not actually house it (this also resolves that whole issue regarding the original game).