Isn't Discourse software aimed at improving internet forums rather than a discussion venue in itself? It's not comparable to stackexchange, which is software plus a community.
But stack-everything only has such a vibrant and focused community because community rules have been made as clear as they have. If you go through Jeff Atwoods blog, you'll see that they are making the same considerations for Discourse, which has it's own "community rules" that ship with it. They're not only writing better forum software, they're also investigating what makes great forums great and horrible forums horrid and they're baking it into their product.
