That's probably true in a straight line scenario, but also consider that the dampers control lateral transfer as well, and in the corner exit situation the car is loaded laterally. Things become more complicated, because we don't generally want more lateral load transfer if we can help it, and a softer outer rear damper in bump will give you more. More load transfer (softer in bump) will decrease rear end grip, causing oversteer.
Keep it simple, but not too simple. And I'm probably wrong anyway!