On the other hand, I would love to see more tech companies being co-operatives, where their members get a say in governance. That'd be the ultimate hard-mode for a business that was dedicated to being rugpull-resistant.

The killer feature is everything is a stream/thread. I argue that is a better UX over Slack, but it takes some getting used it.

As mentioned, Slack is way more polished.

I wish Zulip (and other apps) provided an inbox instead of just ephemeral notifications that disappear once a message is viewed. Lack of inbox means that I have to use unread messages as a way to manage my inbox -- because the moment I click on a notification / take a quick peek at a message there's no easy way to mark it for coming back to later.

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+100 for Zulip though; by far the sanest messaging experience for this kind of context.

(EDIT: unless your reason for using Discord is PTT voice channels. Then it's not.)