That's the thing - Star Wars isn't a war documentary. It's got "Wars" in the title, and the backdrop of the main events is a war, but at its core it's a fantasy story. There's no scenes of somber reflection on the death of all the stormtroopers in the Death Star at the end of the original film. There's no rebels who show up with PTSD as a result of the battle on Hoth. You could explore those themes, and many authors have, but that's not the direction that the actual movies go.

The war is scenery for much bigger events and emotions. A commoner realizes he is destined for something more, and rescues a princess. A scoundrel learns to care about others. People fall in love in desperate situations. A mentor passes on his knowledge. etc. etc.
These things could all happen during peacetime, with the war serving to heighten the stakes. If there's no story or plot reason for something to happen, then it shouldn't happen, war or no war.