Not necessarily. You can leave a lot of room creatively. But a universe bible would make sure everyone is on the same page with the small stuff and make sure that there aren't contradictions.Because the point of creating the reboot was to give the writers a blank background to write from. If you create that bible, you end up with another determined history. May as well keep everything and just drop new #1's for no reason.
Of course not. But it's obvious from what they attempted to keep of Batman doesn't work within a 5 year time span. Why couldn't he have started his Batman career at the age of 22 and now be 34? That's 12 years to fit in 4 Robins and creates a more logical group of Robins. Dick is 25, Jason is 22, Tim is 17 and Damian is 12ish now. That gives Dick 5 years as Robin, Jason about 3 years, Tim 2, Damian 1 and Batman a year of being a solo act. That works much better as a timeline than a mashed together 5 year timeline.We like to believe he's been this avenging hero since 1941, but in reality, he cannot really be the same character. As recent as the first Crisis in 1985, we saw HUGE chunks of his history vanish, his timeline shrink, and his attitude change. We saw Jason Todd's hair change, his origin shift, and his death. We saw the loss of most of the characters that involved Dick Grayson's history, like Bat-girl and Batwoman. They were GONE. Then what is left? Prologue. The same as right now.