Does this crunch actual numbers or just give general balance advice?
It crunches numbers. Give it weapon stats — damage, fire rate, range falloff, reload time, magazine size — and it calculates DPS curves, time-to-kill at various ranges, damage-per-magazine, and uptime ratios. It compares weapons against each other in head-to-head matchups and identifies outliers: 'the shotgun is mathematically dominant up to 8 meters but useless past 12, creating a binary feel — consider extending its damage falloff range and reducing its peak damage for a smoother gradient.'