There is a type of question that is neither off topic, too broad, unclear, nor primarily opinion-based. It's not even too localised. It's just ill-posed, in that it lacks fundamental data to be answered, or it makes assumptions that are invalid. The former problem is ususally fixed by asking for more information, but becomes ill-posed when the requests to clarify are rejected as unnecessary. The latter can't really be fixed within the question itself without un-asking the question.
Two examples came up recently:
- What is the newest Cookie Clicker link? (10k users only; ill-posed because the site had not moved as assumed)
- What is the best CPH for blue charms? (ill-posed because it lacks necessary data and evidently will not be clarified)
The first was closed as off topic, but with a lot of contention. The second was closed as "unclear", but it's currently being voted to reopen because it's not actually unclear, which is actually a fair argument.
After the fact, I feel like neither of these close reasons were actually accurate. Should ill-posed questions be left open? Is it our job then to simply answer them with an explanation about how the question, as it has been asked, is invalid and then attempt to enlighten the asker as best as we can? (That's what the answers on both questions attempted to do.) Or should we be able to close these somehow, and do we need to resurrect some form of "not a real question" to take care of these?