Yeah star wars definitely only pretends to be fantasy. Its actually firmly grounded in realism.
Yeah, sarcasm noted.
But seriously. If your definition of science fiction is “firmly grounded in realism” then you seriously need to do some reading of the science fiction classics. I seriously don’t think a lot of people have enough understanding of just how much science fiction that is not firmly grounded in realism has been produced over the years. Nothing that has faster than light travel is and none of that is fantasy. Purists like Clarke would put it there, but he and all other hard SF writers are in denial about their place in the broad science fiction genre.