I agree completely. More times than I can remember I have found an answer to some problem from old mailing list discussions (in which I have not participated but which are picked up by search engines). Especially when working with some technologies that are not so commonly used. Chances are that someone else has already encountered the same problem and received an answer for it. Though, it's not always easy to find these answers from e.g. mailing list archives, but with chat systems this information is not available at all.
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I agree completely. More times than I can remember I have found an answer to some problem from old mailing list discussions (in which I have not participated but which are picked up by search engines). Especially when working with some technologies that are not so commonly used. Chances are that someone else has already encountered the same problem and received an answer for it. Though, it's not always easy to find these answers from e.g. mailing list archives, but with chat systems this information is not available at all.