Why don't special interest communities work well on Slack?
This was an assignment from an interview in which I was tasked to select a product and "articulate how you could improve the product experience for a specific customer segment of your choice, without creating negative effects".
I chose Slack and decided to address the problem I observed within special interest communities - the larger they get, the less active they tend to become. Click the link to see the 10-page slideshow addressing this issue.