The main justification is really just to prevent stale information. For example we regularly saw people searching for X feature and tagging onto the end of an old thread some rant about how something so basic isn't available even though the feature itself had been developed and integrated into the application over a year ago and the thread was from 2 years before even that.
Likewise for support, instead of opening a new post with the support template and "please read" instructions many people would try to tag what they assumed to be a related issue to the end of something completely unrelated which then confused matters greatly for people trying to help.
Basically for features and support it is somewhat useful as it just prevents stale info. I have to admit I'm not sure if this could be looked at as something more granular if we are talking about meta, lounge, plugin categories etc. (or if this is already the case).
If you have useful info about a topic you are knowledgeable in then feel free to make a post about it anyway, we often tag these with the "tips and tricks" label to make them show up in the "wiki" header at the top.
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