It was a necessary point in the world building of Dune. Frank Herbert needed his world to not have AI or human like robots. He explored alternatives: human computers via Mentats, and Terminator like infiltrators via facedancers. Dune takes a fantasy like approach to technology. There are no lasers, because they would cause a nuclear reaction. There are no robots, because of their past uprising. This was a neat way to…
> There are no lasers, It's been a long while since I read the books, but I watched the 2021 movie* more recently. If not lasers, what were the beams emitted by the space ships, and the portable beam weapon the Sardaukar soldiers when attacking the outpost? Or is that something the movie added?
There's a great moment in the book where a character sets a trap by engaging a shield and fleeing the area before an errant enemy laser eventually connects with it and creates a massive explosion to cripple the invading forces.
With that in mind the careless use of lasers in the film on two occasions is puzzling considering that it would be an extremely risky and dangerous tactic in the book's universe.