Inverse square makes sense because you can model it as a finite number of particles with decreasing density as they move away from the source, like shotgun pell

Inverse square makes sense because you can model it as a finite number of particles with decreasing density as they move away from the source, like shotgun pellets. MND is like if more pellets just sort of appeared out of thin air at a certain distance... It would open up all sorts of different questions, starting with: how do those particles know when and where to spawn more particles? Where does the energy come from (or where does it hide until it decays out in the form of more gravitons?)