Well, I don't point this specifically on anyone, But, err...
Before we had this scheme of automated close reason insertion, I've seen Physics.SE people suggest new users (who ask questions vaguely or badly or whatever) on how to ask questions here. At least, they've pointed out what's wrong with a particular question. Nowadays, I barely see such constructive comments. For example, this one. Recently, we had a discussion on this. And, I said...
The automated close reason is for the purpose that users don't necessarily have to add comments :)
I'm quite happy that I added "necessarily" in that phrase. So, have we really stopped constructive commenting? I know there's no necessity that you should insert comments. But, inserting comments would help a lot. And, stopping comments isn't such a good idea. It'd make things worse...