Maybe they wouldn't. We also didn't have two primaries in D1. Ammo synthesis was somewhat necessary because once you're out of primary, you're down to snipers/shotguns/rockets/fusions/machine guns. Those all burn through ammo fast.
With a kinetic and energy weapon, we do not need synthesis.
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Run a SMG and AR.... you blow thru Ammo fast.
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Assuming you're not just spraying it into the air, you also get plenty of ammo back.
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Play as the Top tree Dawnblade. Fly and shoot. Smgs work best but use alot of ammo.