The Voth weren't villains. They wanted to be left alone, with their mythology intact. And they were also vastly more powerful than Voyager. There could be no "civil war" because the information was retracted, and the population was fed bullshit, just like us.
Why wasn't the culture in "The Blink of an Eye" revisited? They were progressing a thousand times faster than normal space. That would have been interesting. And so on and so on. TNG never rehashed old stories, why would you expect Voyager to? Were you disappointed because the proto-Romulan society or the "Binars" on TNG was never mentioned again? I'm not.
I think the only place Voyager screwed the pooch was not bringing "Caretaker" full circle, because they had the opportunity to do so when the ydecided to write Kes off the show. She should have left the ship to rejoin her people with her rediscovered powers. She could have reawakened those abilities in her people, and freed them from their dependency on the Caretaker. Then they could have used their abilities to undo the damage the Caretaker caused to their planet, restoring the Ocampan society, and bringing the whole thing full circle. The return of Kes should have been positive, instead of what it was.