Twinfinite writes “Caydes death did do a lot of things that the series has desperately been missing. First off, it gave a reason for the story to even be happening. The majority of the missions throughout Destiny 2 all revolve around Guardians simply gathering resources or stopping a world-ending threat.”
Source: N4G PC Killing-Off Cayde-6 in Destiny 2: Forsaken Was Worth It to Tell a Good Story