I believe they should because it would add a new perspective in the game , but only for PvE not PvP . Over all I Destiny would be a pretty new experience if you had the ability to swap from 1st POV to 3rd . Just an idea that bungie should add for the 3rd person lovers out there :)
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As much as I'd probably love it, considering its semi in the game with bladedancer, swordbearer, shieldbearer, and the scorch cannons, I feel like it wouldn't work, But hey! Would love to see it!