In general it's obvious, but I feel that for this project even moreso since it has all the makings of one that'd be extremely easy to enter in development hell. Getting the tone right for it is extremely complicated (one of its leads being a literal child assasin with a dark backstory, even having to use Morrison's Batman run as inspiration makes finding the tone for this hard) on top of all the pressures of it being a Batman movie and part of a larger universe and having to differentiate itself from Matt Reeves take.
Even something like The Batman, in which Matt had all the freedom in the world, took a bunch of time to make. If they don't get some extremely competent talent behind this from the get-go I can very easily see this project ending up like how The Flash did and going through multiple writers and sets of creatives coming and going for years.