See this 'question': Reasons Why Your Should NEVER Hack WordPress Core.
I think non-questions are alright, as long as they're structured as questions. You know, jeopardy-style. The aforementioned example could have been stated "Why might you not want to edit the WordPress core?" That way people can provide their own answers, and the OP could also provide his own answers too.
Non-questions like the one you referenced should be community wikis (and I see that one was marked as such). Some other examples of non-question wikis:
@tnorthcutt As I interpreted it that is what Jeff Atwood suggested to do in last weeks moderator chat although he said it should be done on meta. So in general yes, but maybe on meta instead of on the main site.