I'm restating my position as said ... fairly often on this board, and at least once on this thread:
From a meta standpoint, we
know the relays didn't annihilate the galaxy, because a)
no writer would consider that to be a good ending to a heroic story and

we see people alive in the future. The problem is they presented it in the same way that they presented Arrival's relay explosion, without saying why it's different or how.
Some of us will never be able to accept the explosions at all, and I am not denying them their right to have an issue. At all. Some of us, the 'rocks fall Galaxy dies' idea never occured to them. Again, your right. The middle ground ... I think we should make a conscious effort to change the discussion to 'how did the galaxy survive the relays breaking up?' instead of 'why would they kill the galaxy?' We'll have to go through 'Did they realize the consequences when they wrote this?' to get there. (I'd say it's 50/50 they didn't, and the clarification will smell like a retcon, when it's ... kinda both.)