I'm trying to understand this question which has been edited four times. At this moment, there are about 15 comments, many of which refer to prior revisions of the question. It is difficult to tell which questions refer to which edit of the question; the top couple of questions refer to problems that have subsequently been edited out.
For the purpose of discussion, let us assume that the comments are substantive and not discursive; let's ignore the problems that arise when the comments section is used for discussions.
Someone suggested that we flag obsolte comments for removal; that seems to impose a fairly heavy load on the moderators. I'm not sure that is an ideal solution.
It would help somewhat if there were a way to indicate in the body of the question "edited to address comments 3, 7, and 15", nor is there a way to withdraw a comment when the question is edited.
The only solution I can propose is that when the OP determines that the edit chain has tipped over into confusing, that the question be closed and re-opened. That's not ideal.
Is this a problem for others? Is there a better solution?