They don't need to bring the synths back they just need to buff the ammo finder mod. Idk about anyone else but I can go one damage phase with full power anything after that and I legit get no power to drop until either the boss is at like 10% or the boss is dead....or if I unequip ghorn to switch to witherhoard.
Heck I find more ammo without the mod so what's the point in having it?