I was looking for some good questions about SEO and URL structure, because it is an essential part of web programming, especially when you are thinking about URL manipulation with PHP.
But the best hits via Google were closed by moderators with, IMHO, nonsense reasons.
I think these are nonsense reasons, because those questions are not opinion-based like:
What looks better, a or b?
They are asking for deeper SEO knowledge:
What works better, a or b or something totally different, or does it matter anyway?
And SEO knowledge is not magic, nor a kind of fashion – it's based on rules like every programming language – that's why I do not see any reason to close such good questions with such arbitrary reasons.
The only reason I would commit is that they should ask such a question in Webmasters Stack Exchange. So it is just the wrong part of SE.