With each new season of Destiny 2 comes a new sandbox, and each comes with slight adjustments. As such, each season has its own meta, a set of weapons that everyone will use when playing PvP. The new season came with a good buff for assault rifles (600-720 rpm). This meant that they would be used a lot more than previously.
Towards the end of the last season, Season of the Undying, I completely burnt out on D2. It’s not really the game’s fault, but the grind was just too intense and long.