I have this philosophy about taking time away from new extensions after I've played with them a bit and given feedback, because otherwise I get frustrated when things don't move at "my" pace. And usually, when I come back weeks or even a couple of months later, I can see improvements and am happy to try them again. (Heck, it worked for VE and MV - They both got noticeably better and more usable over time, and the improvements were more obvious when I stepped away then returned.)
This extension is almost the opposite. I've yet to return to it to find it improved as a communication tool. I read the sections below, and I honestly cannot tell who is talking to whom, who is responding to what, without really having to work at it. It is significantly more difficult for me to figure out this page than it ever has been in even the most convoluted discussion on a normal wiki talk page. It's one of the few times where I've looked at something and been completely unable to give any constructive criticism. I've been able to figure out dozens of discussion systems pretty quickly over the years (going all the way back to the bulletin board days, probably before some of you were even born)...this is the most difficult one I've run into for at least 10 years. I know lots of people are really working on this, but from what I'm seeing here, your objectives are so divergent from what I as a user expect from a discussion system that never the twain shall meet.
Incidentally, what brought me here today was an email message informing me that User:Flow_talk_page_manager had moved a page called Talk:Flow Portal/Archive2 (a page that as far as I knew wasn't on my watchlist), and when I followed the link....there was nothing there. I can't tell what got moved where, and there is nothing on that page to tell me what the heck this "user" is. (A bot of some kind? who is running that obvious role account?)