As the help text in the Add Comment box states: >Use comments to ask for clarification or add more information. Avoid comments like "+1" or "thanks". So as long as the comments are improving the post, they should be fine. If you are having a discussion about it, it belongs in chat/meta. In the end, comments can be deleted later, so no big issues with having too many (so long as the post is improved and the comments are then cleaned up).