Having these together is an issue in some cases because, let's say you have a node where users can talk to moderators privately. This means they can only see threads that they created, while moderators can see threads from everyone. If there's an unconfirmed user who's having problems validating their account, they aren't able to use this node. If you allow the Unregistered / Unconfirmed group to post in the node, guests will create threads that they won't be able to see.
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