I like to think of the story of the game only being complete and fully formed after the fact.Like, Luke Skywalker goes to confront Vader? Okay, he's putting himself in knowing peril appropriate to a climax.
He gets into a speeder chase with some storm troopers? He can lose and have a negative consequence, but can't die.
Vader shows up out of nowhere? The rules should make running away a viable option.
In the Star Wars example, Luke didn't have plot armor, but instead had a successful adventure culminating in blowing up the Death Star. He could have been killed by sand people, or crushed in the garbage trap, or blown out of the sky by tie fighters. But he wasn't, and the reason we tell his story is because things broke his way, by luck and pluck. If he had died early on, the player would have just rolled up someone new and we'd be talking about them.