Here is a very interesting reddit post on the difference between Japanese and American players in FFXIV. A sample:
However the biggest difference between JP player and EN player is that you seldom see what is known as shijichu (指示厨) from the Japanese players. Shijichu is NOT taken favorably at all. So what is “Shijichu” it’s a Japanese internet slang word, it doesn’t exist in proper Japanese. It basically mean “Being puerile (childish) and telling people what to do”. EN players like to give unsolicited advice like “Stop using cleric stance, Stop using this and stop doing that”. That is considered Shijichu.
JP players usually let you do what you want (even if you gimp the party DPS or heals). They don’t preemptively point out your choices or mistakes unless something goes wrong and the group wipes. Even if they do point out they do it just in 1 sentence and don’t harp on it, like EN players. There are cases (not the norm) where Japanese players haven been shijichu,to me but a swift “shijichu ka?” (are you being shijichu) from me often puts them in place.
The post is interesting throughout. The comments are also worth reading. In particular, there's a comment from a Chinese player comparing the two sides:
NA players are free style. They don't give you a constantly enjoyable gaming experience. But the diversity itself makes playing with them more fun. And they are more open mind and willing to share which makes it easier for a foreign player like me to make real friends in the game.
I find it very intriguing that the "elite" NA players (at least from Reddit) are very envious of the Japanese playstyle, but the American experience is regarded as friendlier, even if it is more inconsistent.