I have noticed that if you give a reply, and then after a few minutes you post again on the same thread, your two replies get united. The problem is that it looks very ugly and hard to read if the posts are big. Many times it is much better if you separate two different topics in two posts (also when you reply to different people) - IF those posts do not get united into a single one. On the other hand, if you only want to append something to your old post, you can simply click "Edit" and edit it.
What do you say about allowing the posts of the same user to be separated, even if he replies after 5 minutes or less?
What do you say about allowing the posts of the same user to be separated, even if he replies after 5 minutes or less?