I like Zulip. I'm only in one server, which is the community server for my favorite indie programming language. When we migrated to Zulip it didn't have syntax highlighting for our language. So we made PRs to Pygments and now a couple months later our language is supported in Zulip code blocks! I cannot imagine that happening so smoothly with Slack or Teams.
I think the organizational decision to make a "thread" mandatory for all messages is brilliant. It sounds like a small change, but that one difference makes it SO easy to get caught up on the "goings on" in a Zulip server. You can look at just an individual thread, or look at a full chronological stream of messages as they came in regardless of thread. But when you look at the chronological feed all messages are still tagged with their thread title, so it's not disorienting.
I think the organizational decision to make a "thread" mandatory for all messages is brilliant. It sounds like a small change, but that one difference makes it SO easy to get caught up on the "goings on" in a Zulip server. You can look at just an individual thread, or look at a full chronological stream of messages as they came in regardless of thread. But when you look at the chronological feed all messages are still tagged with their thread title, so it's not disorienting.