Hello again. Again this tool is freaking awesome (I'm trying to be professional, otherwise I'd use another word). Even if I want to write one comment in any random wiki, I go to beta features, enable it and then write it. I feel I'm already forgetting how to discuss the old way. One thing, I have seen lots of existing discussion that I want to provide my opinion on and it requires starting a new paragraph in an existing discussion. The case in point I have is when I was asked in my talk page to give my opinion on translation of "Trans women" in Persian and we have a central place to discuss translations. I went there w:fa:Special:PermaLink/30233357#trans woman یا تَرازَن and wanted to add a paragraph saying a translation is better but I didn't want to reply to specific comment. I don't think it would be part of Talk pages project/New discussion but if you think it is. I'm cool with it. I'm more than happy already.
Topic on Talk:Talk pages project/Replying/Flow
I've actually thought about this, in my mind this is called "adding a top-level comment" (or alternatively, "replying to a heading", as opposed to replying to a comment).
The main challenge here is the interface. I can't think of a good way to add a button that does this, and which both clearly indicates that the new content will be added at the end, and clearly indicates that this is distinct from replying to the last comment in that section.
(We currently have a similar problem with the links to edit the 0th section of the page, they all fail to display the distinction between editing the 0th section and the whole page.)
This is not part of the work on adding new discussions, buuuut, you can think about adding a new discussion as "adding a new heading" and then "adding a top-level comment". It's much easier to present the interface for these two actions when you're doing them at the same time ;)
Hmm, I'm no UX designer but one idea would be to put it on top of section next to "Edit section" as If I wanted to do it, I'd click on the edit section link. In that case it would be similar to having VE/SE side-by-side. It doesn't address the section 0 problem though.
phab:T265750 is about being able to change the indentation manually. I wonder whether this could be a special case of that.