I just don't see the point in striving to acquire more soul-shards. What is it actually going to add to the plot? We're already possibly the most powerful entity in the world, if not the universe, capable of beating up gods on a regular basis. The last thing the plot needs is to make us even more overwhelmingly powerful.

...especially if we're then left asking "so why are we still struggling to fight this level 99 squirrel?"