Unless I'm missing something, the FAQ does not explain what is in or out of scope.
When closing a technology-related question, a diamond mod said
It is absolutely off-topic and you are invited to read through the FAQ before posting next time.
I clicked on the FAQ link within "Questions on Japanese Language and Usage - Stack Exchange are expected to generally relate to the Japanese language, within the scope defined in the faq."
The only bits that I noticed describing what should or shouldn't be asked are:
Japanese Language and Usage - Stack Exchange is for students, teachers, and linguists wanting to discuss the finer points of the Japanese language.
which is largely hype rather than meaningful information, and the section starting with
You should only ask practical, answerable questions based on actual problems that you face.
neither of which explain that technology-related questions are off-topic.
I'm not disputing that the consensus is that technology-related questions are treated as off-topic, I'm just saying it isn't documented in the FAQ.