There are myriad kinds of fiction writers in the world today. All kinds of stories are being written for the enjoyment and ponderment of the masses. Out of all those different kinds of writers, I’m of the opinion that those in the area of science fiction and fantasy — and their many offspring — have more work to do then that of their counterparts in say romance or crime thrillers.
The latter have their stories take place in the real world and much of what we see in those stories are extrapolated from reality through their research (if they’re good). It’s different for the science fiction and fantasy writer. For them, new worlds have to be created. If not new worlds then the changes in the real world have to be created. In short, takes a lot of creativity to be a science fiction or fantasy writer and much of that creativity is setting in the story. There is a lot of work involved behind the scenes before the story is ever written.