In his latest treatise on the separation distress hypothesis, Watt makes a compelling case that depression ultimately stems from an adaptive response to problems in the social world. Despite our agreement with many of Watt's claims, we argue here that the separation distress hypothesis only tells us part of the story. Finding little reason to favour his model over other socially-oriented theories of depression, we advocate instead for an integrative approach in theoretical psychiatry that can fruitfully incorporate insights arising from each of these evolutionary views, including Watt's own.