It's not required. It's just there if you want it. Zulip is easy enough to jump into, especially if you have friends who actually care to onboard you into a community.

Adminning a Zulip for a small community group, I've actually found I have better tools to help with this. E.g. in Slack, we had constant nags to "please reply in the thread!" In Zulip, I can just move messages where they belong, and either leave the automated notes there to show where the messages went, or DM the person to let them know what I did.