Originally Posted by
Assam
Cass and Steph (and Helena and JPV) aren't going to get their histories back, the first two because of editorial and the latter two because not enough people care. Even if Kon, Cassie, Bart and Tim all end up remembering each other, the actual books they were in together sure as Hell can't be canon because of all the other characters and events involved.
There are more examples, but unless Doomsday Clock does what you say can't be done, fix everything in one story, which it won't, we are never going to have any idea about the history of this world.