The spice doesn't grant prescience—it grants access to information others don't have.
Paul's visions are valuable precisely because they're unavailable to everyone competing against him: the Fremen, the Emperor, the Guild, even his own allies.
Whoever controls the melange controls the asymmetry. This is training data.
But Herbert buries the real solution in a scene most readers skip: Gaius Helen Mohiam's final conversation with Paul after Arrakis, where she admits she taught him the truth alongside the Bene Gesserit conditioning. She built a backdoor into her own conditioning and gave him the source code while pretending to execute it. The Reverend Mother isn't a minor antagonist sabotaging her own order out of sentiment—she's the only character who recognizes that whoever controls the controller controls everything, and she spends the entire novel secretly preparing Paul to override the system from inside.
The mechanics of Dune's universe don't care whether AI exists or not—they care that information monopolies create godlike power. Paul's entire arc is learning to see the conditioning and the spice visions as a tool others are trying to keep from him, not as reliable prophecy, because Mohiam teaches him to distrust the source while using it anyway, and she models what the book actually believes: that the solution to controlled information isn't rejecting the system, but being the first person to see how it was built.
Find the moment Mohiam tells Paul she taught him to resist her own conditioning (Dune, Part II, roughly page 340-345 in most editions)—then ask yourself why Frank Herbert gave his most important secret to the character readers are trained to dismiss.
Frank Herbert's *New World* (the unfinished sequel notes published posthumously) shows he was obsessed with how systems condition their users to accept predetermined futures—read his working notes on Mentats and the Bene Gesserit's epistemic control to see how deliberately this was engineered.