We've just launched our first NPS survey through Gainsight. Unfortunately, it's impossible to set the "comments" section of the question to Required. We strongly value that feedback from our customers. (We customize the header for that comments box to be, "What is the most important reason for your response to Question #1?")
Given how important that information is for us, we want it to be required, [i]and we want it to be populated in the "comments" section of the NPS widget in the C360, so that it's highly visible to the CSMs. If I make it into a separate question, so that I can set it as required, then it will not be populated into that spot in the C360.