Regarding this:
https://kotlinlang.slack.com/archives/C0B8W32VA/p1605215879057300
One-off "someone tell me what's wrong with this" or "someone tell me how to do this" questions absolutely belong there and
should go there because then they're indexed and searchable later on.
Slacks are best for thoughtful group discussion, which these kinds of messages actively discourage or otherwise suppress by burying them. Think of how many times a discussion comes up and AnonBob ignores the room and breaks up the conversation with a completely unrelated question about how to use a suspend function.
I'm in slacks that are 1/10th the size and twice as active because of community guidlines focusing on forum quality and actively incubating it. It should be a community, not a dumping ground for anyone too lazy to wait for an answer on stackoverflow.