First, AskLO is not a forum. It is a Question & Answers site. @robleyd’s comment gives a very good synthesis of the differences.
The main idea behind a Q&A architecture is to encourage production of various “solutions” to a question. These solution can be upvoted by visitors and the site engine will reorder them by “relevance”.
Since the question itself or solutions may need to be clarified, additional information can be requested through a comment under the relevant post, i.e. not anywhere. You must wisely choose the post to which you reply.
Solution and comments structure the layout of a question web page. Consider question and solutions as being “moveable” chapters of a topic. Comments become explanatory information in each of these chapters. Solutions should be independent from each other. Comments are related the the “chapter heading” under which they appear. Comments keep their chronological order.
Contrary to threads, all posts in a Q&A site remain editable to contribute to conciseness because a topic is supposed to have a longer timespan than a conversation. A question and its answers can be of interest to many users facing the same issue. Then it is nice to jump instantly to a (the?) solution.
However, in response to spamming attacks against the site, some protective measures have been enforced. It is now required to access some trust level to be able to freely edit own posts. New users are allowed to do so only during a very limited time after submission (~1 hour).
You’re partly responsible for the mess in the topic you reference: you create too many “comments”. You don’t summarise enough and frequently important technical information is missing.
Above all, use of a Q&A site requires a change of mind compared to forum. There is no thread (as you noticed). Therefore, all must be asked in the question (ideal case) with all the details to avoid the need for contributors to scroll down. You must be aware that the decision to participate in the solution or not is challenged in the few first lines of the topic.