In my own experience, I've found that a depressingly large number of people seem to ignore or be offended by even the most gently-phrased feedback, which is part of why I want parsers to be an easily accessible part of the game client in some form.

Might not make a difference for the players who are completely out to lunch and wouldn't notice or care about the addition, but perhaps a few of those who are trying in their own way (but who are full-on defensive in regards to anything other players have to say) might look at game data and go "Oh, ok...I guess the numbers don't agree that what I'm doing is the best option."