The former would defeat the entire purpose of moving the setting
Why is that the "entire purpose"? Why aren't there purposes plural?
which - it should be noted - is exactly what allowed us to predict the overall plot of this game with such accuracy like one and a half years ago.
It looks like a ship will be traveling from Milky Way to Andromeda to explore and colonize. That's about all we've got so far. Is that really predicting with "such accuracy"? Like I said earlier, some random person posted almost the exact same thing as the first post in the "Casey Hudson Fan Idea" thread. The trailer looks like a one-minute trailer for that guy's idea.
Either way, its an ark, that much is obvious and so the details of when or why it left are rather semantic, dont you think?
Semantic? No, I don't think so. The parameters in which these people would travel to Andromeda, who spearheaded the journey and the catalyst to why they left, would change the tone and purpose of the story. Is it an "ark" or a simple colonization/exploration effort? Are they running from the Reapers or fleeing a deteriorating Milky Way?