Sequiturs improves the quality of arguments asserted in online discussion, because Sequiturs arguments use a format that demands coherence. This will tend to filter out arguments that can't be formulated coherently.
The Sequiturs format helps to keep the discussion of an argument focused. Someone who disagrees with an argument can point to the exact step they disagree with, and the discussion can stay focused on that step.
Sequiturs is a better way to discuss arguments online, compared to the existing tools.