I don't join Imperials because I like Balgruuf, he help me fights the dragons.
I don't join Stormcloaks because I don't like Ulfric, he hate elfs too much.
And I don't want to make a war because I love most buildings in each hold,
they are beautiful, I don't want them to get ruined by the war.
In my opinion, I don't think that I have to do every quests that Skyrim has offered,
because I can choose what I wants to do or don't, it's my destiny to decides.
Maybe, in the future the Imperials and Stormcloaks may have come a peace agreement one day.
Because they have done that to stop the dragon's attack to save the world.
So why can't they do that again, this time they fight together to stop the Thalmor.
Dragonborn is the key who can changes the world, they would listen to him because he's that important.