The discursive nature of the social sciences is not necessarily in the nature of a dialog or discussion. It is possible to post good subjective questions regarding social science discourses and receive good subjective answers without there ever being a discussion between users.
Consider: “How does Mandel’s exegesis of political economy differ from I I Rubin’s?” There is no need for discussion here. While multiple valid answers exist, users don’t have to discuss the topic with each other to answer. Answers need to provide one of, some of, or all of the exegesisexegeses of the valid differences.