Believe me, this is something we fight everyday. Just recently we’ve started issuing warnings for overaggressive tagging. Some users who want an answer fast go as far as tagging @administrators then every single admin/mod individually, all in a single reply. 
But tagging is just a part of the overall problem. Reply notifications are also mixed in with the bunch, and it’s really painful (to me at least) to see 3-4 notifications in a row in your notification panel, all leading to the same topic/URL.
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