I also suspect you overestimate the effect that posters here have on the playtest process. The main source of data is the massive surveys they put out which gather volumes of data orders of magnitude larger than 1, 10 or even 100 posters here can generate.
Because of the recently released videos. I can be wrong. But they are recently responding to feedback in videos before the survey has closed or so shortly thereafter that they can't have looked through the feedback. So what are they responding to if not forums and twitter?
Of course every opinion is valid. But I don't have to like those opinions or the effect it has on me.