Re: Can't be a single movie
You have to remember that the society that Dune is set in is not a naturally evolved one, but rather a post-apocalyptic wreckage. At a point earlier in time, they had produced powerful artificial intelligences, but had not managed to keep these either friendly or on a short enough leash. Nor, apparently, had humanity started to turn into cyborg post-humanity, since the entire scenario turned into the Butlerian Jihad where the AIs got wiped out.
This left the society with a weird wreckage of AI technology, much of which was useless in fundamental ways. They had gravity control but only on a limited basis. They had shields which work well against most projectiles, but which fail badly if hit by laser-like weapons; their laser weapons in turn are deadly if used on shielding. Presumably AIs were capable of managing the technical intricacies of stacking shields or something.
Their technology included some form of faster than light drive, which worked but dropped the ship out of space without the ship being able to see what was actually there at the end point ahead of time. Again, AI presumably had an answer (or several answers, like only doing long distance jumps between known-empty points of space) but humanity wound up using Spice-addicted individuals who are able to predict whether dropping into normal space at a certain point will be deadly or not; very limited but accurate prescience.
This society is living in the wreckage of a much greater one; there's not really any surprise that thus handicapped they carry on messing stuff up. Indeed the movie is a repeated series of "How will they get out of this one" scenarios.