I actually think Zulip is an exception to this, because its Stream>Topic hierarchy encourages organized conversations.

At my org, we consider Zulip to be an archive of sorts, and make an effort (a small one, because Zulip's UX makes it natural) to organize our communication such that it serves as a source of information for a future date.

I wrote a whole article about this a while back:

https://monadical.com/posts/how-to-make-remote-work-part-two...