Just like other mods - the more broad / generic mods like “minor spec” or “special ammo finder” wouldn’t be as powerful or cost the same as a specific enemy type “spec” mod or a specific weapon type “finder” mod.
But it would be cooler to have a more robust selection of mods of these types to cover more situations.
Perhaps you don’t have enough for a Rocket launcher ammo finder mod, but for less you can run a generic heavy ammo mod- that’s not as powerful, but will still give you a bump.
Fallen spec
Hive spec
Vex spec
Scorn spec
Cabal spec
Primary finder, reloaded, flinch, scavenger, dexterity
Special finder, reloaded, flinch, scavenger, dexterity
Heavy finder, reloaded, flinch, scavenger, dexterity
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Bungie deprecated the generic ammo finder mods when they affinity for weapin specific ammo finder mods, which was requested by the community. They also stopped creating enemy spec mods because they made balancing a variety of activities more difficult.