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When I google for an answer, and one of the top hits is a stack overflow topic, it almost always (>90%) has been closed as being "non-constructive". I know there is a policy against topics that lead to debates, but my observation indicates that there must be value to aggregating "debates". When studying a new aspect of programming, these debates can quickly catch someone up on major views and pros/cons, even when there is no definite answer (which is also useful information!!! scientist speaking here).
Has there been any testing to see if there is actually any significant downside to keeping these open? Especially if there has been a large number of incoming referrals (like from Google) to certain topics?
Update: A common trigger is when looking for a good tool(s) to do a job. SO topics often come up in these types of searches and are hugely helpful... which is sort of funny when you notice it's been closed... then you wonder if the information is no longer up-to-date.