37 years on, what does everyone think of this revelation from Return of the Jedi? In the long run, was it worth it? My two cents: no. Before she was revealed as Luke's sister, we were led to believe two things: 1. Luke and Leia could conceivably become an item, although narratively, it was unlikely. Luke and Leia got along too well to be a couple, Han and Leia hated each other too much not to be one. However, it was at least a possibility, what with her laying one in him in The Empire Strikes Back. 2. The Force itself was very egalitarian. Luke didn't have it because he inherited it from his father, he had it because everyone had it. It was, after all, "an energy force created by ALL living things." Those who don't use it, we are told, have no faith. "You don't believe in the Force, do you?" "I find your lack of faith disturbing." Seen through the lens established by the first two films, even Leia's use of the Force to find Luke in Empire doesn't demand any explanation beyond the fact that anyone can have it. Afterwards, how did it affect the story? 1. Darth Vader uses the prospect of turning her to the Dark Side to bait Luke. That's about the only useful purpose it had in that story, other than making it easy for her to choose Han over Luke. 2. Her Force sensitivity is justified by saying "the Force runs strong in your family." Bye-bye to the Force that anyone can use, now it has to run in your family. Lucas decided we needed even more explanation that this, and gave us midiclorians. This creates numerous problems with the sequel trilogy. First of all, Leia never completes her own Jedi training, nor is she ever again treated as a lead character. She is in The Force Awakens for all of 10 minutes, and is sidelined in The Last Jedi in favor of Laura Dern. You'd think being Kylo Ren's mother would land you a more prominent role, but no. Having Rey, a character of no known lineage, be Force sensitive, appeared to be a return to form for how we treat the Force. But the films couldn't make up their mind about that. Rey thinks knowing her parents' identity is important to knowing who she is. In the second film, for all its faults, we return to an idea from the first two films: it doesn't matter who your family is. That doesn't determine your destiny or abilities. But then Rise of Skywalker says nope, you can't have the Force unless your father or, more to the point, grandfather did.