Quick, try to think of any fantasy story in which the good guys win by coming up with a new invention or technology. Versus, say, having to find some ancient supernatural relic or rallying behind a magical "chosen one." Hell, try to come up with a story where they win by inventing a new type of magic or concocting a new potion or something. Where's the fantasy version of Steve Jobs, damn it?
This is even true in the franchises with sci-fi elements. Take Star Wars, a sword-and-magic universe that also has cool spaceships, cool spacesuits, and cool space guns ... but still wants us to think that old-fashioned mysticism is way cooler. The Jedi order is treated as a long-lost culture, with powerful magic no technology can replicate (the first time "the Force" is mentioned, a nonbeliever mocks it and then is promptly proven wrong via a Force-choke). In the same movie, with barely any training, Luke Skywalker is told to abandon his modern targeting computer during a firefight and wing it, trusting that the Force will guide him.
The fate of the universe depends on a redneck believing in ghosts talking to him and his ability to shoot space rats.
This is a guy who's sitting in a piece of technology that allows him not just to fly, but also to breathe in outer space, harness the power of light itself as a weapon, and travel to distant planets ... but he doesn't trust it to aim a torpedo? Hell, with their level of technology, they should have targeting systems that can pull off precision headshots from the other side of the galaxy. The ship's computer should be so much smarter than the pilot that when Luke tries to deactivate it, it'd merely shrug off the command. "You push all the buttons you want, monkey -- I'm gonna go ahead and complete the mission without you." Meanwhile, the antagonist in that scene is a former Jedi who is now "more machine than man" (machine = evil) and leads the technologically advanced empire to crush a small rebellion. The galaxy is saved not through strength of arms or martial skill, but by mystic mind tricks.
Though we can't help but notice the mystical Force did exactly fuck-all for Alderaan.
But Star Wars was simply following an old sword-and-sorcery trope. The Lords Of The Rings is particularly fervent in its anti-industrialist agenda, constantly equating nature, forests, and rural communities with good, while the bad guys build noisy assembly lines (and even use gunpowder, which is portrayed almost as a dirty trick). The most densely populated kingdoms are all being slowly corrupted from the inside, while the more rural areas remain untainted except by modern conquest.
New Line Cinema
Possibly because the good guys were too drunk to accomplish anything.