Oh please. Do tell me how easy it is to line up a shot in Crota's End when you've got dozens of Thrall running at you from multiple directions in the Abyss, with a Knight charging in the background. I can think of several places in the raids, and especially in Nightfalls where you're swarmed by hordes of enemies in similar situations that make it difficult to land the precision shots needed to make Scout and Pulse Rifles effective.