I recently asked this question on ELU: Should there be a comma in "You again?"?
The answer to this question may be obvious to some of you, but for me, it isn't. I tried searching on ELU and other sites for an answer, but I couldn't find definitive information about this anywhere. I was hoping I'd get an answer here, but surprisingly the question was closed as 'off-topic':
Questions that can be answered using commonly-available references are off-topic. A list of these references can be found here: List of general references
I checked the list of references, and as phenry says, none of the listed references answer the question. While I'm not sure what's the exact reason behind the closure, the only reason I can think of is that the question was too simple. Is that an acceptable reason for closing a question?
Should this question have been closed? If so, what is wrong with it it? And how can I improve it, so I don't repeat this mistake again?