>>213073941 (OP)
If they wanted to do that, they’d have had to gone with a TV series. That means completely different talent attached since movie actors/directors don’t commit to big multi season shows typically, would have required a much bigger budget that would be hard to get or would have had a much smaller budget that would have cut into quality, and of course shows can be cancelled easily so no guarantees about actually finishing the story, especially with a slower paced series that would turn off many in the audience
You’re kinda right, don’t get me wrong, the movies literally never tell us as to why spice is actually important to space travel, we don’t see a single navigator or even the interior of any ships iirc, which I was looking forward to