Is it really so surprising that people keep using good guns over worse guns? If Bungie really wanted us to move on, the best way to do it would be to give us guns that perform as good as the old ones, but differently. Instead, Bungie is going for the "stick" approach with no carrot: driving us away from guns which continue to outperform weapons that are theoretically in their tier (i.e. Raid-tier) and simultaneously driving people away from a game that seems determined to force them to switch out their gear every 4 months. I like switching things up and trying new guns, but only as a way of switching up my playstyle, not out of the shear necessity of keeping my damage relevant.