Sure, just to play the devil's advocate here (I support for giving feedback in constructive manner when possible), sometimes giving a feedback in a constructive

Sure, just to play the devil's advocate here (I support for giving feedback in constructive manner when possible), sometimes giving a feedback in a constructive manner is simply inefficient and some manager may not have time to do it every time they think something isn't perfect. Hello X, while I think you have done these three features A, B, C well....blah blah, you could do E in a better way by doing 1,2,3. This superfluity can add up, making some people get straight to the point.