... Online forums are not face-to-face conversations and require different communication techniques. You cannot assume people will be able to read your intention without proper context and explanation.
This is true. I try to say what I have to say, clearly and precisely. But very often, when I look at something I have posted, or am about to post, I am compelled to make edits, because I see how what I said, could be construed very differently from what I intended.
It can be challenging to do this while also being concise enough, that readers will be more likely to read the post.