I try to message users whenever If I think they need an explanation or some reminder. However, it can pretty difficult to contact everyone, and my inbox gets bombarded with messages. I'm thinking of dedicating a time at the end of each week to reply to the more important messages.
The report history feature is a nice one though I admit. Gives you some feedback on your reporting habits, and does promote improvement.
It's nice when you have the time. For the most part there isn't a lot of information people need, but on the off chance it is good to get a little feedback.
So far looking at the report history feature I can us the "unhandled" to gauge whether or not the board moderator wants to deal with those posts. For me a lot of the time my reports are for wrong section, and certain boards aren't as finicky as others in regards to where they want certain topics.
The only feature I think it is missing is the report itself that was submitted e.g. "low quality", "wrong section", " plagiarism" and the many others. It could help hone in on why a report was bad, or unhandled in case you forget exactly why you reported it.