* Poor idea -- misses out on issues of motivation, and the soft sides of how people influence each other.
* Isn't great for hard side either. Most good arguments are too nuanced for soundbites.
* Indeed, it would be interesting to see the argument for Reasonwell (over github and similar) presented in Reasonwell's format, and then used as a discussion for how such a system should be designed. This would be a good first use case, and of similar complexity to most political debates. My claim is it would be difficult or impossible to do this in their format.
* The implementation doesn't work (dialog pops up when you try to post a comment, and "okay" doesn't work).
* UX is unclear (I couldn't figure out how to start a debate after minutes of trying, or how to search in useful ways, etc.).
* System isn't open source/free software. This is important for a tool for democracy.
Overall, good ideas were scarce.