Responses such as yours may well discourage people from thinking about how the site could be better at all, for fear that they might not be doing it politely enough and might draw a belittling response.
It seems to me far more likely that they would think about it a tiny amount less, and express their thoughts more constructively, which would be better overall. We will still have far more people pointing out work that needs to be done than people willing to actually do the work.
Responses such as yours may well discourage people from thinking about how the site could be better at all, for fear that they might not be doing it politely enough and might draw a belittling response.
It seems to me far more likely that they would think about it a tiny amount less, and express their thoughts more constructively, which would be better overall. We will still have far more people pointing out work that needs to be done than people willing to actually do the work.