Too much detail can bog down any story. Enough with the history of gunpowder, the geology of Hawaii, the processes of whaling, and cactus and tumbleweed.
The challenge - and much of the fun - of writing in an established future history lies in incorporating new knowledge while remaining true to what has gone before. Expanding and enriching, not contradicting.
History buffs expect historical background in historical fiction. Mystery readers expect forensics and police procedure in crime fiction. Westerns - gasp - describe the West. Techno-thriller readers expect to learn something about technology from their fiction.
What kind of hard SF do I write? Everything from near-future, Earth-centric techno-thrillers to far-future, far-flung interstellar epics.
Lots of science fiction deals with distant times and places. Intrepid prospectors in the Asteroid Belt. Interstellar epics. Galactic empires. Trips to the remote past or future.
