Because this is a thread about SciFi. As a fantasy fan I HATE being lumped in with SciFi and horror. While sometimes there's some overlap and blurring between them, (IE, the Star Wars films are more appropriately considered Sci-Fantasy, if not a fantasy OUTRIGHT) it's two ENTIRELY different genres and should be treated as such.
Star Wars is should be considered hardcore science fiction. The reasons why are simple.
1) Spaceflight capability with lightspeed velocity
2) Phased energy weapons (handheld blasters and turbo lasers)
3) Space Stations
4) Holographic communications
5) Artificial Intelligence (droids)
6) Multitude of various species
The debate of science fiction or fantasy rests on two essential Star Wars cannons.
1) The Force
2) Lightsabers
To quote Carl Sagan roughly, "Any advanced civilization utilizing technolgy in front of a lesser advanced civilization will appear 'magical' to the lesser advanced civilization"
That being said, lightsabers are a given due to the technology of focusing crystals and immensely powerful energy sources in a compact form. This technology is way beyond our capabilities right now.
The "Force" falls under a different category. Evolution. The human brain only employs roughly 10 to 15 percent of it's capability. This is much greater than humans say 50,000 years ago where brain usage was lower around 7 to 10 percent. As the human body evolves generation after another, the brain usage will increase. Who's to say where that usage will be? Telepathy, Telekinesis, Levitation, Pyrokinesis, Clairovoyance, and of course energy release through fingers.
Only now in the 21st century we can forsee the future of mankind coupled with tecnology and evolution. Two hundred years ago, modern man still living with supstitious beliefs created fear and paranoia over things he didn't understand. The average person back then was illiterate and had to soley believe what the leaders of the time said about life in general. Now, the average person is literate and can make thier own decisions on thier own.
To me, the fanatsy books filled with dragons and wizards are really another facet of science fiction due to the "magic" as nothing more than advanced science not understood by the majority.
I've spent 30 years reading books on the matter and this is the best explanation I can give between science fiction and fantasy. They are the same, just different outlooks.