I see what you're saying, and I agree with all your points, but there are positive points as well: 1) When you need low-latency help, i.e. where you need to ha

I see what you're saying, and I agree with all your points, but there are positive points as well: 1) When you need low-latency help, i.e. where you need to have a conversation about your problem, a real-time communications medium is ideal. 2) They do tend to lean towards becoming communities, and communities are very good at driving engagement within that community. I've joined a few Slack communities and become a contributing member, whereas I experimented with early Stack Overflow and haven't really engaged with it since. Honestly, I think they tend to lead to stronger communities, since you have to join and participate even a bit to get your answer out of it. With GG/SO, you can just pop in, read your bit, and move on, having never contributed.