Remake/Remodel: DC Rebirth so you don't have to

So, having not really followed DC at large but strategically holding Doomsday Clock at arm’s length:
Did they really fuck up the timing with it so much that the culmination ties into crap that did or was supposed to happen in the main line of comics a long time back? And I’ve also read that they’ve already introduced a couple celestial-level characters capable of screwing around with all of reality that makes the whole deal kind of redundant?

they're called "the editors" but they answer to the awesome power of "THE SHAREHOLDERS"