Who doesn't know Batman's backstory at this point? Most probably already have an idea about the sequence of events that led to a young Bruce Wayne vowing to become Batman. It's a tale as old as time at this point. Matt Reeves, the director of the upcoming DC Comics film, The Batman, knows this. This is why he didn't bother to explore the caped crusader's backstory in The Batman.
In an Esquire interview, Reeves revealed a couple of ways that The Batman would deviate from previous live-action adaptations featuring the dark knight. For example, The Batman won't tell Bruce's origin story. Reeves reveals that it's something that audiences have seen "so many times." He added that "it's been done too much", which is why Reeves didn't include it in the film anymore.
It's been quite the journey for Matt Reeves' The Batman to get here. Initially, the project was supposed to revolve around Ben Affleck's Batman from the DCEU. However, when he left the DCEU, which he recently shed light on, Robert Pattinson was cast as Bruce Wayne and Batman while the entire film was moved to an entirely different continuity. But, as we've learned, The Batman will skip his first year of crimefighting and his early childhood to jump straight into his second year as he fights against multiple villains at once.