This is no knock on Pixar or other animated films to date, but I must admit that even before I knew the technical reasons why, the voice acting of two films, Monster House and Surf's Up, stood out to me. They had a quality, an improvised/interactive quality lacking in other animated films.
It turns out that in both cases the actors were all in the same room recording at the same time. They overlapped. They improvised. They acted against each other in a way that is extremely difficult, if not impossible, for voice actors sitting alone in a booth.
Should this be a new trend? Do you like it more? Less? Didn't notice? Don't care? I think I would at least like to try taking this approach for my own work in the future and see what happens.