A comment is a comment (important for discussing) which I want to see, no matter if content-free or not, the origin requester (IETF Last Call/WGLC) of such comments SHOULD specify which type of comment they want if necessary. As long as it is a comment-on-discuss-lists any can ask questions to the commentor to know the comment-reason if necessary. IMO, we don't want no-comment, ignorance, or no answers if requested, which will mean no discussions. AB