<p>The SE universe has a <strong>"comments are not for extended discussion" policy</strong>, with the effect that if such an extended discussion occurs, moderators intervene and "move the discussion to chat". </p>

<p>I am a user that does not use chat -meaning that such a movement effectively kills the discussion for me. So I have the motive to ask:</p>

<p><strong>"What are the <em>evidence-based</em> arguments in favor of this policy?"</strong></p>

<p>I personally see none. I stress that "general logical/plausible arguments" are useless after all these years. They may have been useful in the beginning of the SE universe, but not anymore.
Is there any evidence that extended discussions in comments lower the quality of the SE sites content? Is there any evidence that they confuse users? And  is there any evidence specific to CV?</p>

<p>There is certainly evidence that the policy disrupts useful accumulation of knowledge and pisses users off. Where is this evidence? It currently writes this post. </p>

<p><strong>PS:</strong> I used also the tug "bug" because this is "an erroneous behavior in the system that needs to be fixed" (the human system in this instance).</p>
