considering their demi gods, why do they need me to kill puny mortal npc A or go clear out dungeon B? some of the quest were for the amusemant but some felt like they "needed" me which doesnt seem right at all.

I took some leeway with lore and created a organization like the blades, which I called the Acquisitioners. They were secretly established by Tiber Septim to acquire any dangerous artifacts, deadric or otherwise, and then store them away from the world in a secret vault. Tiber Septim was the only one outside of the organization to know it existed. After centuries the Acquisitioners have slowly begun to die out because of their almost non-existent recruitment, leaving only 9 members left in the time of skyrim. It's the duty of an Acquisitioner to do whatever possible to acquire an artifact even if they must sacrifice something or someone to do so; because if they don't then all of Nirn may be put into danger.