Easily the most problematic thing I've found in the game thus far is the mechanical synergy between, or perhaps the lack thereof, the processes of both sprinting and reloading.
Though not entirely realistic, I reckon it has the capacity to bring an increased sense of fluidity to Destiny 2's current game-play.
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I feel like they could tweak the point during the reload animation that you actually get ammo in your clip. Bring it down to 75% or something. That way the reload animation feels faster if you need to start sprinting.