Originally Posted by
Green Goblin of Sector 2814
But at least by the time Flashpoint rolled around, the DCU was still a comprehensive universe where you could keep track of most of the important events that happened therein. That's because Crisis was so well-planned out. Marv Wolfman not only created a bible for the things that were supposed to remain in-canon afetrwards but for a lot of the characters post-Crisis, the Crisis was just that: an event that happened within their universe. Plus, a lot of the franchises continued on with the status quo they had pre-Crisis, with retroactive changes being revealed later on. The Green Lanterns continued on pretty much unchanged, Dick Grayson had still become Nightwing and was the leader of the New Teen Titans while Jason Todd was still Robin, Barry Allen was still dead and Wally West was taking up the mantle, etc. In other words, the impacts of events pre-Crisis were still being felt post-Crisis in a lot of cases to the point where it still seemed like the same universe in a lot of ways.
Compare that with what happened in the New 52, where it was sold literally as a brand new universe, right down to character pages claiming that certain characters made their "first appearances" in post-2011 comics. On top of that, a lot of the events that were going on pre-Flashpoint were simply halted or cut off and new storylines were rushed in order to take their place. In some cases, writers who had plans in the pipeline were completely blindsided by the reboot and forced to make last-minute changes because characters they were planning to use no longer existed or events they were drawing upon no longer happened. For example, plans for a JLI revival were swept under the rug because whoops, the JLI had never existed before in this continuity and the JLI reboot that we did get was arguably the worse for it.