Why zulip instead of the good ol' IRC?
It has modern features. It stores message history. It has a fairly unique feature of letting you create ad-hoc "topics" (that go under a "Channel") that make it easier to manage the flood of conversation.
Last I checked, IRC wasn't really mobile-friendly.
1: IRC loses all messages to you while you are not connected
It has modern features. It stores message history. It has a fairly unique feature of letting you create ad-hoc "topics" (that go under a "Channel") that make it easier to manage the flood of conversation.