Guardians kept running into a problem with the beefier bosses and minibosses of Destiny 2. If they weren't at the appropriate power level or in a purposefully difficult playlist activity, they would eventually run out of all ammo types and be forced into some choices that didn't feel great, if they even had a choice, in the hopes of killing anything around or continue to contribute to team DPS. This was a problem exclusive to Destiny 2, as Destiny did have Primary Ammo Synthesizer as a resource. However, in that game, it was underutilized as Primary ammo drops were plentiful.