I never understood where there's a weird online movement (if it matters) that states Star Wars is purely fantasy and Star Trek is sci-fi. By textbook definition, I guess that makes sense, but sci-fi and fantasy aren't just one thing. Both genres have evolved and transended their original definition, and now it's a giant blur with new hybrid genres like steampunk, etc.
Star Wars has fantastical elements, but no friggin' doubt it's sci-fi. Spaceships, robots, aliens, Death Stars. It's based on technology. It doesnt' have to explain how everything works or have a social commentary. Looper doesn't explain how it's time travel tech works, but it's still frigin' sci-fi.