Then our choices are meaningless. That's good in an RPG, right?
In a way.
Here's the thing, you get to play through a storyline, and you get to see what could have happened if the storyline had taken a different toll, that's what great about RPG's.
That they allow you to see what the other side of the coin looks like.
But the official storyline is what matters for the lore.
But your choices aren't meaningless.
You get to see what could have happened.
The "what if" scenarios.
While the official storyline does not follow your choices at least you had the option to see what could have happened.
So are your choices meaningless?
In canon, yes.
But gameplay-wise and lore-wise, no.
(By lore-wise I mean by showing what the lore "could have been".)
For those opposed to this, I wonder how you'd like the Fallout series. :confused:
Oh and as a final note, when TESVI rolls out and you find out X won, then if you want to you could always play as X when playing Skyrim and ignore Y forever.