Research on policy responsiveness of the European Union has adopted the systemic model from national contexts. This focusses on the static congruence or the dynamic adaptation of aggregated policy output and similarly aggregated public opinion. Approaches in this vein provide relevant insights and uncover a surprising degree of EU responsiveness. Yet, this debate contribution argues that they only insufficiently capture indirect accountability chains and the emerging challenges of public EU politicization and mediatization. We establish the need for procedural perspectives that addresses how the different EU institutions perceive and digest public opinion and subsequently influence it through communication. To further this research agenda, we sketch the contours of a procedural model by highlighting possible variation at the input, throughput and output stages. Going full circle, we suggest, allows us to better understand the responses to public opinion and their wider implications for the societal acceptance of the unfinished supranational polity.