Meanwhile, Frank changed the backstories on Barbara Gordon, Alfred, Catwoman, the Joker and even Jim Gordon. Never heard a whisper of complaint.

........

While I sympathize, I do remember DC going to great lengths at the time to say Miller's work was not to be considered part of Batman canon or continuity, so essentially an Elseworlds' type effort. That's allowing for a lot more creative leeway than a total reboot of the company's flagship character.