This isn't quite the same, but I wrote an essay for Wikipedia a few years ago (2005!) on why encyclopedia articles shouldn't contain pro-and-con lists. Even though I didn't know much about cognitive biases at the time, and was thinking about the specific domain of Wikipedia articles rather than argumentation or truth-seeking in general, it may be relevant.
One of the things that occurred to me at the time was that pro-and-con lists invite Wikipedia readers who already support one "side" to think of more items to add to "their side" of the list, and add them. In LW-speak, they inspire motivated cognition for people whose bottom line is already written.
This thread is for discussing anything that doesn't seem to deserve its own post.
If the resulting discussion becomes impractical to continue here, it means the topic is a promising candidate for its own thread.