I wanted to mention something related as well, and this post is a good opportunity. You mentioned that the ratio is about 7:1 on Discourse:SO. I think that the ratio of Slack:Discourse is about 100:1 if not more. And this I really believe is hurting the Julia community and makes “googling” Julia much harder than it should be. Discourse still has a permanent nature, and thus it isn’t a big deal if questions are answered here or in SO. But Slack is a different story…
Problem is, I am not even sure how to initiate a discussion about this, or what to do alternatively, given that the Slack is so good, but everything is lost after a week…
(EDIT: I’ve encountered this problem while teaching my physics course that uses Julia)