I for one don't take part in discussions where real names are required, as the requirement discourages people with (non-trolling) strongly opposing views from taking part in the discussion, so it's pretty much guaranteed to be an echo chamber (or at least biased towards reaffirming the consensus) - that is, it is worthless for me to learn from, and it carries the risk of making me think I have validated my own opinions against opposing points of view.