It’s not necessary to constantly explain away all the contradictions. Marvel for example doesn’t bother to explain how everything is still incontinuity/how it all could’ve happened when there are stories that reference Vietnam or the Cold War or the Soviet Union or event of the era in which it was written yet somehow it’s all happened within a 15 year timespan from “now”.
But I do think we need an origin story. Of the ones available, Birthright, Man & Superman, and Morrison Action are the only three that can be slotted in with minimal fuss. I don’t care which one they choose or how they justify it, just pick one.