Then there’s something like Wonder Woman, which took place long before the arrival of Superman or the birth of Bruce Wayne.
Aquaman is the first post-Justice League DCEU movie, so DC now has to truly contend with the questions of why other DC heroes don’t pop in to lend a hand.
This is not something that other DC movies have even had to worry about in recent years.
Man of Steel was the first installment in the DCEU, and many of the heroes were either in hiding or unable to help Superman during his battle against General Zod.