Originally Posted by
AlexanderLuthor
Fictional New 52 World: The further we get into it the more it is apparent that most of the major events pre-52 happened in the New 52 timeline, just with a different twist that they could never adequately explain w/o doing the whole storyline over: Superman's Death, Batman's "Death", Sinestro Corps War, Dick Grayson becoming Batman, The Demon stories, Long Halloween, Blackest Night, When in Rome, the original JL stories fighting Amazo, Kanjar Ro, the classic JL chess game, many of the Brainiac stories, on on and on. The high points happened, just in a slightly different way or with a different cast - when it's important they show a flashback.
Real World: DC didn't want to scrap all 75 years of its history. It's almost impossible to build from scratch when people already know the characters. They also want to give people more of a reason to pick up graphic novels. If you think something has bearing on what happens today, even if only the general overall theme, you might be more likely to read it.
So assume that the "big stuff" happened, just not exactly as you read it, but the outcome was largely the same