I don't see an issue with having a DC for Oceania. A DC is just a cluster of servers that are logically grouped together. SE could locate these wherever they wish. While English is the main language in Australia and NZ there are numerous other countries that come under the Oceania heading. For many of these countries English is a second language that is used to communicate with players that have a different native language. It appears that this works adequately for them. It also appears they understand why the Japanese groups would generally prefer to have all Japanese language groups. However the current server setup more or less forces these groups together or creates situations where people cannot find like minded players. As both the Oceania and Japanese players have what I consider reasonable rationales the better solution is to find a way to accommodate the Oceania players and segregate the two player bases. This would be accomplished by creating some English preferred servers that are closely related an given preference in DF and PF (their own DC perhaps).