Brave was in the works during the peak creative period, it was just that Brenda Chapman leaving the project midway (in 2010) caused the snarls that would be present within the film. It wasn't automatic, I would say, Monsters University I think is okay just because I like Mike and Sully's relationship and it had a really nice twist lesson at the end, and Inside Out was pretty good for being an abstract take on emotions, but it was a notable rocky moment that finally dipped with Finding Dory. (The Good Dinosaur was another story that was conceived in 2009, it just took ages to get off the ground, though by then, it had changed hands. Bob Peterson was the original creator, but I don't know how much of his original vision remained.)
It's honestly just a pretty sad time. 2010 was also when Illumination entered the scene and that brought about a new standard in animated films, especially since DreamWorks was struggling to stay financially afloat after Steve Jobs died (although you could tell DreamWorks was trying to do well during the first half of the 2010s, it was a weird time).