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 history of the Victorian Age will never be written: we know too much about it.

I do not have any pets. We travel too much.

Sometimes too much to drink is barely enough.

The trouble with wedlock is that there's not enough wed and too much lock.

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.