When a game has many players who ignore the main quests and journey off to create their own stories, one should question the value of embedded narrative. Does a game like Skyrim need a main storyline? The writing and character voice acting were okay and forgettable, just there for when I was in the area rather than being something of interest. I venture to say that the presence of a main story that you would find in other RPGs that don’t have such an open world is dissonant with how The Elder Scrolls series tells stories best.
There are actually multiple narrative structures in conflict with one another in Skyrim—and arguably in Morrowind and Oblivion as well. The presence of fate as a central concern grows stronger in each installment, with Skyrim sometimes going as far as to control your character’s movement for you. The concept of fate is antithetical to the type of play that The Elder Scrolls promotes, which is player-focused and controlled. However, we’re so used to convention that we expect cutscenes and epic storylines to unfold before us. We’re not used to the idea of “This is my story” unless it’s a Minecraft or Dwarf Fortress that we are experiencing. Skyrim doesn’t need a storyline for the player to experience their own.