This paper explores the metaphysical foundations of critical theory in Marcuse and Habermas's postmetaphysical alternative. It argues that Habermas's attempt to free critical theory from a normative conception of life‐activity deprives it of the conceptual tools required to accurately diagnose the fundamental structure of social problems today. It thus concludes that Marcuse's efforts towards specifying a life‐grounded foundation to critical theory must be renewed if the project of human freedom is to be advanced today.