I've seen a lot about this on the forums recently so I thought that I would finally say something. Back when TTK was almost out, bungie had said that they wanted to increase weapon variety, so they removed primary burns. I think that this actually made the variety worse, since now when I go into a strike with arc burn, or enemies with arc shields, I don't have to worry about changing my primary, I just have to change my secondary (my heavy always stays the same). I can just stick with my hung jury at all times if I wanted to, since it just does kinetic damage. In year one, I would always switch between my Fatebringer, VoC, Word of Crota, Fang of Ir Yut, and many more, based on the situation. I felt like it was more necessary to change my weapons. I would love to see a return of primary elemental burns, even if they come at a cost. TLDR: Elemental primary burns were great, and made the game more fun. And they should come back.