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The need of such feature is connected with forums' rules. It is used when somone is breaking the rules of forum - especially multiplies topics.
When the topic is a copy of some previous one, hidden deep in forum's history, moderator can put link to the repeated topic, close new topic, and write an apriopriate extract from the forum rules.
In such cases it is much better than deleting topics, because it acts as an example, reminder and warning. It helps to keep order on forums. I would strongly recommend adding it.
The second thing about that feature are topics that act as an announcments. E.g. when we publish the rules of forum on it, we create a topic, we pin it (to be always on top) but we don't want anybody to write sth in it. It just has to be an information. And in such case, closing topic does what we want.
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