I don't quite get the reasoning where you talk about the quality of Japanese error messages, then talk about making it even harder to decipher. Sure you can com

I don't quite get the reasoning where you talk about the quality of Japanese error messages, then talk about making it even harder to decipher. Sure you can compress meaning into short strings of kanji, but readability definitely takes a hit when you do that, even to a native speaker. It's not like we're displaying this on paper; there could be better ways to show errors to non-English speakers, eg. more descriptive messages like "エラー: 配列の範囲外へアクセスしています" can be shown by default and perhaps the original error message can show up when you mouseover on it or whatever. The "searchability on Stack Overflow" argument may vary depending on language, by the way - Japanese is one of the languages where technical information written in the language is fairly abundant (considering JP natives tend to avoid writing in English themselves and rather stick to writing Japanese), but this may not be true for other languages. Another factor is how likely the speaker of the language is to be English-bilingual.