May I add to that post by also saying, even though the dcau may be seen as an elseworld, batman's creation would be a consistent funnel in all elseworld narratives as a focal point of importance.
While plenty tell tales of his devotion to his cause from an early age and the tradgedy of him losing his parents, none highlight the importance of bruce wayne losing his humanity and his chance for a normal life.
the scene in the cave when he pauses to put on his mask is the last essence of the most important part of us leaving and that is hope, he loses himself to his cause and shuts down any hope for happiness in his life. That moment is directly responsible for why bruce wayne after batman in beyond is a lonely old man incapable of sharing his life and isolating himself from all who love him.
in fairness, every batman story with bruce being dark and broody and untrustworthy could be related back to this point of importance rather than the death of his parents. If not for the disappointment of andrea beaumont, that scene would have played out differently, notice the variations between the night time bruce wayne vigilante and batman as we know today, they are two separate entities, one for hope of a better world and one without it.
for a scene which carries only two words of dialogue, it's amazing how much it actually provides for the genre and entire ethos as a whole. The slight pause, the way his eyes go and the manner to which he disregards alfred's concerns are all beautifully played out to shirley walker's amazing iconic score.
