It's not about being able to speak/write Japanese or not for the JP ONRY, it's because of some of the bad manners NA players have imo.

I've seen NA players in FFXI who just leave PT right after they level since they don't care about rest of the PT, people go way too much AFK as for if JP party they will tell you ahead of time they may go AFK a lot since blah blah... there are a lot more examples I can bring in but I don't want to start anything... I already talked about this one in another post with more details and response I got on that thread wasn't that good either so I'll keep quiet...

This is one reason they are considering language specific servers for these type of players, most of the time it has nothing to do with being able to communicate, it's more about manners.

Not saying it's a bad thing but it's how different economy plays differently, NA players think it's OK to do what they do while JP's don't and while JP's put JP ONRY, NA players really hate seeing that.

Hey my linkshell in FFXI had both JP and NA players and we were doing well overall, so if you find the right players you should be fine. For those saying JP ONRY just ignore them and move on.