Obstacle Avoidance is only for "follow me" or "watch me" modes, for when you won't have your eyes on the drone. You have to physically fly to each waypoint for a CCC mission, so there's no need for OA.
I disagree that’s there’s no need for it. Just because I set the way point doesn’t mean I know the path/angle it might take to get from one point to the next. Today my drone just barely cleared a tree top. I got really lucky.