I've heard Zulip is much better about threads, but in Slack there are some annoying things about them. Everything is crammed into the sidebar, so reading log snippets suck. Also, I noticed people will often post their initial message, then a @here with slightly more info in the same channel. I'm not sure where to begin the thread from. I haven't been able to intuit the rules for alerting people or uploading things like images into a thread.