Feedback is important. For it to be useful, it has to have three components:
- On time,
- On target,
To give a textbook example, when you hit your thumb with a hammer (instead of hitting the nail), you get instant feedback. In about 200 ms you start to feel the pain, the pain is localized and depending on the force you applied the pain is more or less intensive. This 'negative' feedback is positive, because it stops you from hitting yourself time and again. When you actually hit the nail on the head, you get 'positive' feedback, because you feel the nail sinking in...
Stack Exchange has good 'positive' feedback. You get notified when you get an answer or a comment. But 'negative' feedback is avoided, in the sense that there are no notifications on deletions or closed questions.
I guess the reason to avoid negative feedback is to avoid flame wars. But closed questions have been around for a long time and there is nothing negative about the internal discussions to reopen those...
There are some questions on Meta Stack Overflow about closed and deleted questions and maybe these could be avoided by having a 'negative' feedback loop. In the end, all feedback is positive!
Clarification: There are questions on MSO about closed and deleted questions on main sites. This is not the most important issue, but a notification in these situations would be helpful.