Interesting, normally SW fans hang on to the sci-fi etiquette as a form of credibility in order to further argue that it's not
for kids. But still, it's not sci-fi, if it was, it would be terribly bad science-fiction - any respectable work of sci-fi wouldn't put up with any of that
Force magic.
The first Google link on a Star Wars science-fiction search quotes the emperor himself:
“Well, I had a real problem because I was afraid that science-fiction buffs and everybody would say things like, “You know there’s no sound in outer space”. I just wanted to forget science. That would take care of itself. Stanley Kubrick made the ultimate science-fiction movie and it is going to be very hard for somebody to come along and make a better movie, as far as I’m concerned. I didn’t want to make a 2001, I wanted to make a space fantasy that was more in the genre of Edgar Rice Burroughs; that whole other end of space fantasy that was there before science took it over in the Fifties."
Again, a science-fiction work that would want to "forget science" would only be an absolutely terrible one.