You could also see it as the inverse. Online we talk as we really are, saying what we really think, and thus the quality and depth of the discussion will inevitably be higher and deeper than in the 'real world' where we are faced with relentless groupthink, desire to conform, self-censoring to avoid unrelated career blowbacks and so on.

Moreover online people can take the time to write something good (not saying they usually do of course), whereas in-person debates usually suffer from being shallow, filled with interruptions, half baked ideas, people getting artificially upset to try and 'win' and so on.

I'd actually like to see far more experimentation and research in online commenting and discussion forums. There's really been very little movement in this space since CmdrTaco retired.