This is something that came to mind recently it’s strange they haven’t done more of it. Last time we got any sort of Co-op content was in V&V and that was a single scenario.
I honestly enjoy the Co-op campaigns, I’ve played through most of them with a buddy, it’s the most fun I had in this hand over multiple. So I think they should add more Co-op campaigns and even new features to the Co-op campaigns like matching with randoms or people in your friend list.