Seldom
Your point would have been very good had it not been for those few who did and progressed the understanding - it is their lacking of the courage of their convictions to come forward openly that is the point plus several basic points that should have been clarified that haven't and the lack of correction to posters writing erroneously when it has no impact.
Had many issues been properly addressed and an absolute blank been drawn on my particular line of inquiry, then your point would have been valid regarding the latter.
Thus your smart reply is, I suggest, moot.