I think we should standardize the idea that answers on this site have to have an explanation in English.
This point was not just inspired by this answer. I believe this happens now and again where answers are given which simply link to a Japanese resource, or include copies of text from Japanese resources, without explaining in English. Or even if original answers are given in Japanese without enough supporting English.
To be clear: this isn't about linking to off-site data, it's about presenting answers in Japanese only, with only Japanese references. (An English answer with a Japanese link would be fine.)
It seems self evident to me that if most, if not all, questioners on this site could read Japanese explanations directly from Japanese resources, they would not need to ask their question here. Maybe more importantly, answering in Japanese excludes a great deal of people who are using this site to learn, even if the questioner might be able to understand the references.
It seems to me that it isn't merely the de facto reality that this site discusses Japanese with English, that it is also a huge benefit. There are a lot of sites available already where discussion in Japanese about Japanese can take place. There are also many sites that offer very beginner level information on Japanese in English. There are few sites which offer the same level of in-depth analysis while still maintaining accessibility to many levels of English learners.
It's a missed opportunity when an answer is given such that it was an answer that could have been obtained from searching in Japanese anyway.
As such, it should be axiomatic that answers be first and foremost in English. Supporting information in Japanese is great, but only to lend credibility to the English explanation, not to supplant it.
At the very least, it seems questions in English should be reciprocated in English. Otherwise, it's a little like saying, "go learn Japanese, and then you can have the answer."
Now, to be clear as to what I'm proposing, I am not at all saying that answers in Japanese be blocked, or that those who answer in Japanese or speak Japanese should be discouraged on the site (to be double clear, I am not talking about who uses the site at all, but how the site is used.)
What I am proposing is only that it be understood that a question is not really answered until an answer understandable in English is provided. Put up all the Japanese reference you want, or copy and paste Japanese text in. It's just not done until it's comprehensible to more people on this site, beyond those who read Japanese with near fluency.