I have noticed that the site prompts two uses of the comment boxes: one, to clarify the question/answer; two, to indicate why one down-voted.
I wonder if it would be more to the advantage of the site and its goals to reserve the comments boxes for clarification of the Q & A's and for direct instructions that would help the contributor improve the Q/A.
This would magnify the "Q & A only" aspect of the forum: that would be all one really encounters--Q & A (rather than discussion).
The site would present itself as more friendly: it would be devoid of the appearance of shallow arguing.
The quality of the communications would be improved--instead of quick thoughts or reflections being tossed back and forth, it would require opposing perspectives be framed in a well thought out answers.
Better balance would be achieved for the answers as opposing sides or camps of an issue, would be endeavoring to present logically, clearly and thoroughly from their camp.
Facts would be easier to find and more easily identified.
It will be more clear to those who contribute that quality work is welcome and valued even if it comes from an unpopular camp, so long as it is in keeping with the goals and boundaries of the forum.
Ways to improve will be highlighted.
Therefore, could we consider an overhaul of the comments, to weed out and encourage the community to present well thought out answers instead?