Reeve is the BEST. If I was ever going to play all the Compilation stuff, it would be for him.

The other thing to remember is that on at least some of these worlds, they have been conquered by an almost global culture at some point, often in the near-recent past, and it could be that the language and currency are simply left-overs from that.

That definitely describes VII's Shinra conquest. I... didn't really love VIII, so would that be another under that heading?