This is a linkpost for https://www.kialo.com/
I came across this site and it seems quite interesting to me. I believe that the discussion format can influence the discussion itself a lot. Not sure whether exactly the Kialo format is optimal but I consider Kialo as at least a promising attempt.
"I consider Kialo as at least a promising attempt." This problem hasn't been tackled afaik and it's nice to see someone working on it!