Well, you have a point, but the separation is hardly as stark as all that. Both film and television have works that definitely qualify as Science Fiction, and some are even original rather than adaptations from books.
A few examples: 2001: A Space Odyssey, Fantastic Voyage, Moon, much of Twilight Zone and Outer Limits, Prospect, etc.
And for that matter there is plenty of SciFi in print as well, and it isn't all novelizations of movies and TV shows.
There is certainly more room for exposition in a novel (a fact which plenty of authors have abused over the decades, and plenty of directors have abdicated responsibility for by tacking on lengthy voiceover or on-screen text introductions), which often allows for more complete worldbuilding to explore whatever contrafactual premise the story is built around, but it is possible on-screen as well, as long as you don't rely solely on the dialog to convey it. For that matter, books shouldn't rely solely on the dialog for that purpose either.
Of course, on-screen dramatic works aren't the only ones that face the problem of conveying a setting in few words. Novellas, novelettes, and short stories have similar constraints to various degrees.
A few examples: 2001: A Space Odyssey, Fantastic Voyage, Moon, much of Twilight Zone and Outer Limits, Prospect, etc.
And for that matter there is plenty of SciFi in print as well, and it isn't all novelizations of movies and TV shows.
There is certainly more room for exposition in a novel (a fact which plenty of authors have abused over the decades, and plenty of directors have abdicated responsibility for by tacking on lengthy voiceover or on-screen text introductions), which often allows for more complete worldbuilding to explore whatever contrafactual premise the story is built around, but it is possible on-screen as well, as long as you don't rely solely on the dialog to convey it. For that matter, books shouldn't rely solely on the dialog for that purpose either.
Of course, on-screen dramatic works aren't the only ones that face the problem of conveying a setting in few words. Novellas, novelettes, and short stories have similar constraints to various degrees.