All the characters in Rogue One are so amazing and have such great story arcs but omg, the story arc for Cassian Andor though, that is not something we have seen explored in Star Wars film!!
Sure we have had good guys fighting the good fight or bad guys turning good and finding redemption or bad guys just straight up evil or even scoundrels and outlaws joining up to defeat evil, but not a story like Cassian’s! Not a good guy who has to do evil things for the sake of the greater good, not a good guy who literally has to put morality aside and do the job because it means survival for something bigger than himself.
This kind of grey area is something Star Wars has never touched upon so explicitly in the films - it’s always been so black and white, good vs evil, we have always seen the Rebellion as just this good entity. But Cassian’s whole storyline, the existence of the intelligence group who has to do dirty things and shady things and outright bad things just so the Rebellion has a chance to survive, that puts the Rebellion in a completely different light, you start to see the shades of grey, about the price that it takes to achieve the freedom from the Empire, that in trying to do so, they even have to resort to such kind of violence and sabotage that the Empire does.
It makes the Rebellion so much more realistic, because this is what war is like, this is what a rebellion for freedom and survival is like, sometimes you have to do the bad things, sometimes you have to forsake any morality, because the mission, the ultimate goal, has to come first or else all will be for nothing. Because idealism alone can’t win wars, someone has to be the one to put their hands in blood so others can come out of it clean. War is messy, war is never that simple and idealistic and pure good and pure evil as people like to think.
This brings such complexity to the Star Wars universe that the saga films have not done. To see the layers and struggle, to see what it took for that victory against the Empire to be achieved - Cassian’s story and the story of Rogue One, it brings so much more weight and meaning to that final celebration on Endor!!!