Besides how much shooting do they do on duty?
Bacon costs $16/lb, but elk only costs one bullet. Do the math.
Why do you want a central controlling authority in the first place, whether or not it is geographically sharded? Why is there any need for any sort of database, 4D or otherwise? Simply have the drones talk to each other and negotiate how to avoid each other directly, like small plane pilots following visual flight rules. No need for a database. No need for any authority.
What is the best load for a drone? I'm thinking #4 buck shot.
That only takes out the symptom. The problem is at the other end of the flight path.
It's more than just a matter of brain size, it's also the ratio of brain size to body size. A bigger body requires a bigger brain just to coordinate.
Tell that to the Brontosa...er Apatosarus (poor creature. It went extinct twice!). Anyways, brain the size of a meatball - body the size of an articulated bus.