> The no credentials are accepted policy makes sure the experts stay away in droves. Imagine someone putting in decades of work to gain expertise in a field being told they need to argue with a neckbeard with too much time on their hands. No thanks.

It's the unalterable division of labor. Scientists are experts, science journalists are clueless. You'll never get the first group to take up the job of the second group because they have way better, more interesting, more important things to do. Same with Wikipedia, even if experts were sought out, they wouldn't want to edit it.