Can be useful to people besides the asker
Questions that are general and could help many people are better than too specific ones that only help the asker. For example, if part of a song line confuses you, it's better to ask about that part than to ask what the whole song line means. Maybe that confusing phrase is used elsewhere in Japanese too, but I doubt that the whole song line is.
I think this question was deleted because I can't find it now, but within the past 6 months, there was a question asking how to translate a list of very specific phrases for a flyer. I didn't even know what some of the things meant in English. This is not a good question because nobody can use it besides the asker.
Here's a similar example (although not as bad as the above question): What does 女子高生に唾液かけた疑い 逮捕の男「困る姿楽しい」 mean? This question will help very few other people besides the asker, if it even manages to help others. A better way to create this question would be something like "How is the Japanese in newspapers different from textbook/conversational/normal Japanese?" This could help a lot more people than asking what the quote from the article means.