History, naturally, is limited to the momentary view society takes of actual events at the time the book is written. Novels bear no such limitation, and so can reveal, or at least hint at, truths that remain outside our experience.
Some extremely important concepts have been introduced through the medium of fiction; just to name a few from science fiction (Per the thread):
1. The idea of the Dyson Sphere was inspired by science fiction, and most of it's more practical variants and in between steps were explicitly given form in science fiction stories. Any consideration of the not-so-distant future scope of humanity is quite beyond history's capacity to consider.
2. A. C. Clarke's thoughtful prediction of geosynchronous communications satellites several years in advance of their actual creation.
3. The concept of nanotechnology was introduced and thoroughly explored by science fiction.
4. Potential ethical concerns of population control, organ transplants, cloning, AI and human analogs, and a host of looming issues too large to list get frequent exploration in Sci Fi novels.
5. In the more speculative realm, deep space travel, aliens, and parallel universes.
You can't have a theory without a hypothosis, and you can't often get to a hypothosis without some wild, if educated, guessing. The novel is the perfect format for making those guesses which, even when wrong as they often are, can reveal important possibilities and details about the nature of our future. History is knowledge revealed by experience and discipline, but it still often errs or is subject to the undue influence of the society of it's writer. Novels, and Science Fiction in particular, are unbound by the strictures of what's actually happened or actually possible, and so can explore the outrageous and sometimes necessary outer limits of reality.
In short, don't dismiss the creative while swallowing whole the restrictive format of known, experienced truth. There's room enough in any mind for both.

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