Examine any heated fan dispute in Star Wars, and at the core of it is a question of size. Why on earth is it size?

How big is the Vader's command ship? 8 km? 12 km? 12.8 km? 17.6 km? 19 km?
How big is that Death Star? 120 km? 160 km? 270 km? 500 km? 800 km? 900 km?
How big is the galaxy? Bigger than ours? Smaller than ours? Is it the same one?
How big is the droid army? The clone army? The stormtrooper corps? Millions? Billions? Trillions? Quadrillions? Quintillions?
How many people live on Coruscant? Alderaan?
How many worlds were in the Empire?

There's a problem in Star Wars. The problem is that Star Wars is huge - epic, enormous! The story of a galaxy!

... and also tiny. Everything hinges on individual decisions, single battles. Single fighters in those battles. It's the story of one man - Anakin Skywalker, his destiny, his rise to greatness, his fall to evil, and his redemption by his children.

Which is more important? When C3P0 saves the galaxy by telling campfire stories to child-sized teddy bears, the moral of the story is that the little people matter, no matter how big the stage. Star Wars is as big as we can make it without despairing that our heroes can't leap across it in a single bound and change the entire galaxy in a heartbeat.

If we convince ourselves that the galaxy is too awesomely big for one poor farmboy to enter stage left and turn the whole thing upside-down in a tiny old snubfighter, we've lost Star Wars. We also lose it if we convince ourselves that it's unimpressive because it's too small. Star Wars needs to be both epic and intimate to draw us all in.