If the Debate Pit is to serve as a type of containment for users/topics, then I think it has some short comings.
First and foremost, I can't access the Debate Pit due to my low post count. From my perspective, the Debate Pit seems more like an added perk to contributing users rather than a safeguard or containment unit. Personally speaking, I'm primarily a lurker and join on sites when I see something that upsets me or motivates me to respond back. I would like to think that newer users should be the ones where containment is geared towards rather than veteran users who are accustomed to the site and therefore less prone to starting fights where they should not occurr.
Second, if the Debate Pit were to function as an actual containment sub-forum it would be largely ineffective. This is mostly because when a debate begins in a given thread, it is often not involving the majority of the people who have contributed to the thread but rather involving two individuals going back and forth over a point of contention. Moving the entire thread to the Debate Pit because of two individuals would compromise the fact that the rest of the thread primarily is not a debate and was not supposed to be in the first place. The more effective action would be to contain the two or more users who agree to disagree, therefore allowing the regular thread to proceed as normal.
In consideration of this, I feel like people who are mature enough to disagree with one another yet have the patience to listen to each other would consider visitor messages or private messages. Making a separate thread in the Debate Pit seems excessive. Unruly arguments are prone to moderators using infraction, probation, and lock-down measures to keep the thread under control rather than jettisoning it off to Deep Space.
I understand how the Debate Pit can function as a psychological deterrent. If you give someone an arena where they can voice their argumentative side, then that user feels less repressed and less likely to unleash that side in other places. However, a big part of using the Debate Pit in this capacity primarily relies on the user themselves to have the maturity to recognize that their own content will be a conflict. After realizing this, they also must consider how their post will affect everyone else and should make a decision of the whole rather than themselves. If a user is mature enough to suppress their own urges to this extent, then they should have sufficient will power to reconstruct their post into an effective pro-discussion post rather than an illogical fallacy or derail to the opening thread.
I think that when we consider the Debate Pit to be a containment field, we have admitted that the sub-forum is in a sense flawed. It is not something effective in its own right to spawn ideas and mesh out thoughts, but rather a detractor from the rest of the forums. Resorting a sub-forum as a means to an end intereferes with its utility to be seen as useful in itself. Someone raised the point that debate itself can be an effective process of meshing or solidying ones own thought process. However, I don't believe that if the popular sentiment is that the Debate Pit is a sort of containment unit that people will still retain such an interest. Rather, they would want to post in the thread to a relevant audience that has made relevant posts on the topic. No one wants to be contained, ostracized, or isolated. They just want to be heard.
I don't identify with sub-fourms like the Debate Pit because I personally don't understand debating itself as a motivator. I personally find it more interesting to understand other people, how they work, and why they do the strange things that they do or get into the jams they find themselves in. The two aren't mutually exclusive when it comes to conversation, however as an underlying motivator I haven't reached a point where I post anything with the belief that I'm right and in the know. If I believed that then I probably wouldn't be curious about getting feedback from anonymous individuals all over about what they think.
If this isn't representative of what the Debate Pit is then I apologize. I understand that I'm arguing against a personal conception rather than an actual piece of work because I don't have access to it. However my intention was not to attack a straw man. Rather question the underlying purpose of what areas like the Debate Pit really serve and whether this function is unique enough to merit it being kept to itself.