The "not constructive" close message reads as follows:
I'd like to propose a wording change that I feel better explains what Stack Overflow is not:
This question is not a good fit to our Q&A format. We expect answers to generally involve facts, references, or specific expertise; this question will likely solicit opinion, debate, arguments, polling, or extended discussion. Alternatively, it is not a question about a programming language, but a request for mentoring/debugging assistance, and as such would be better suited to a forum or chatroom. See the FAQ.
The reason for this?
Some "requests for mentoring" (i.e. "can you help me figure this out please?", and then iterative questions in comments to solve various code problems one at a time) can be quite well-written, and some contributors tend to get very rude when such a post receives closevotes/downvotes ("why won't you HELP? This is a site for HELPing").
In fact, in my view, this is not a site for helping at all, but a Q&A about programming. That the answers will help people is — albeit by design — a side-effect of that categorisation. By this I mean that we don't just throw its format away when we might be able to HELP someone some other way.
"Not constructive", "too localised" and "not a real question" can at times be a near match to reasons the system offers us to close the questions; I reckon "not constructive" is the best match to questions that are not questions (and, no, "can you help me?" and "plz help" do not count as questions about programming languages), but its description doesn't really match this rationale at present.
An argument against this might be "well, if it doesn't say that, then your view on SO is wrong". However, I don't think that it is, and from what I've seen I'm far from alone.
It's time to take SO back. It's a Q&A site and I'm sick of having to explain this to people who are looking for an IRC channel to take them through an iterative process of debugging, tutoring and explanation. That is not what this site is for.
Perhaps making this clearer will help. At the very least, it means I won't have to write out explanations like this any more...