Interesting point on the "globally comprehensible subset". I agree with you completely for international correspondence. What I had in mind was more of message

Interesting point on the "globally comprehensible subset". I agree with you completely for international correspondence. What I had in mind was more of messages and docs required for a product itself. I had a personal experience building this quite successful app iRead on facebook and I would most always mess up the grammar or the tone in the news feed, which would then go through repeated corrections from people in the US. People who have formally studied creative writing with English being their mother tongue would be able to message better.