With Discourse, inactive topics (and categories) will quickly become invisible anyways. And afaik, categories you cannot post in do not show up in the category dropdown in the composer.
However, the hamburger menu would become somewhat cluttered. 
With Discourse, inactive topics (and categories) will quickly become invisible anyways. And afaik, categories you cannot post in do not show up in the category dropdown in the composer.
However, the hamburger menu would become somewhat cluttered.