Agreed!

To clarify the terminology, "guests" in Zulip (and other team chat products, e.g. Slack) generally refers to users with an account but with limited access. https://zulip.com/help/roles-and-permissions has more detail on that.

We've been tentatively planning to use the term "web-public streams" for streams that an open community has configured to be accessible without creating a Zulip account. The project is quite far along; the latest PR is here:

https://github.com/zulip/zulip/pull/16728

(The PR looks stale, but that's only because we paused integrating it to focus on finishing 4.0; I would be sad if we don't have it at least in beta this summer.)