Ecamples:
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Public category for an organization that have private subcategories for committees.
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Private category like for discussion group/email list.
General public users wont see these categories at at all so site admins have to use things like pinned topics, group page, etc.
Even users who are members of a private category but are not logged in won’t see that category. So users get lost when they come back to the site and can’t find their private category.
It would be nice to have category view and menu options to surface the categories to users with a reminder to login or instructions to join.