We haven't really seen that on film before, though? I guess they just didn't want to waste time with an early years Batman again.
Well, if they're drawing from Morrison...That's only if you ascribe to the "Batgod" version of the character. (which never made sense because sure, he can take down the Authority and the JLA, but The Riddler and Penguin are constant thorns in his side. It's a lot easier to overlook in comics, but movies less so, imo)