Which is plain writing and elaborating the universe the stories take place. Ornamental elements. They don't make a story sci-fi. That's why I said, it is about the story they tell. What's the story in Star Wars in a nutshell? Good guys vs bad guys, diversity of the peoples scattered around the galaxy, politics, war. The oldest story in the book any intelligent species bound to write in anywhere in the universe(s). What's the unique element of the story? The Force. It is not even the philosophy built around it, because it's just the concept of power defined and buffed up with magic. It's a fantasy element. Don't you also think it has bit of a 'soul' quality in the arhaic religious sense? Gifted with the force, they are either evil or good. Considering the weight of duty, they are like a prophets a bit and a weird aristocracy class.
Now, take it out of space, put it on a planet. Put it on earth if you like. Can we tell the exact same story with ordinary technology? Yes, we can. We can tell it with stone age technology with the Force as it is. So hyperdrives, and gravity generators, alien species don't make a sci-fi. It puts a silly, affectionate expression on your face whenever you hear the voice of a certain droid, no matter how old you get and that's about it.
A few examples to point out something objective as much as possible. Can we take the space travel, spaceship, the gravity generator, AI technology
or a piece of bone out of Space Odyssey and tell the same story? Can we take the robotics technology from Asimov's series or from Blade Runner and tell the same story? We can't.
That's what I mean when I say, it's about the story they tell. These are the examples of fiction that transformed the human thought and its limits by telling stories in sci-fi plots. This is not an arbitray distinction.
Do we feel the need the elaborate, add and stretch these stories as fans? No. But that's what is going on with Star Wars. That's why it ended up in Disney. Hence the expression 'glorified toy box'. Because while the material is not suitable to make anything original, mature out of it, you could invite adults to be kids to enjoy this way safely. From the beginning it was something thin, it got stretched and stretched... he got tired, worned out. But it's good business. Also fans will discuss about it forever, so the original spirit will never die.
Self aware AI, has a hybrid element. It's not just 'evil' -which is a religious, therefore a fantasy element- per se, it is just over intelligent without any emotion or morality. Its intelligence has not evolved the archaic way as ours and actually obeys the very first set of orders; it take care of humans and help them. But AI faces a dilemma and solves it from the most logical way. It designs better robots and program them to breach the three laws to control stupid humans who are certain to annihilate themselves through sheer stupidity. This process could be seen as the sci-fi element perhaps. But Asimov has given us a premise. It's much more than an idea. In the end, it's just power to control. The greatest powers available, intelligence and knowledge. It's the engineer who builds AIs and robots to begin with. It's a product of human intelligence and technology. It's a human story.
The culture it created is huge. The problem of morality, existence and being. Evolution of human intelligence. It opened questions like what's free will? Intelligence? Most importantly, what's the relationship with intelligence and morality? Can morality and free will coexist? Can we talk about a real free will? Can human create artficial beings with free will? What happpens if we do? I know these are so worn out stuff again, but in its time when people were reading these for the first time, the most complicated machine in a home programmed to do something by itself was the coffee machine. Today, every AI story is based on this premise. Noone can beat it.
A lot of people think, Matrix is science fiction. It's a dystopian action and it would have been the worst program ever written in Matrix world. A man named Plato told the same story 2500 years ago by using just a man and a cave.
When you look at the Force, it's a natural, hereditary power that is belonged only to chosen characters; a kind of aristocracy class, if you will. Yes, Obi-wan says it is in all living things, but he is just talking to the kids watching the movie. It's like Uncle Ben supposedly telling Parker, "with great power comes great responsibility". It's a special power drawing a picture of absolute good and evil. You could interpret and use the way you want, of course it was used by a lot of people. Why wouldn't it be?
[I could claim Esmeralda Weatherwax has the greatest gift of Force and create a new class with her. She has the faculty of a Sith, but she chose to be a Jedi to get even. Do you know a better Jedi than that? She is not gonna switch sides because of clinic depression. Not to mention it is a better Twin story.
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Like you, a lot of people love Star Wars very much and as they percieve the science fiction as a higher genre than fantasy, they want it to be defined with that genre. The thing is, science fiction is a fantasy with a theme. It's a sub genre of fantasy. But Star Wars is not telling a story in that theme.