If you don't camp often enough, you'll miss vital character development. However, there's only new stuff every once in awhile. I can't tell if it's number of times camped out triggered by other quest advancement.
Yeah, I'm starting to notice this issue.
For instance in my last playthrough with a new character I reached the point where you get rid of the three goblin leaders and there's a party in your camp with a single long rest before and I missed at least two-three scenes I've seen with the previous characters.
I think the game needs to be more explicit on when a rest is "required" for story bits.