From my PoV, i dont have problem with 'JP only' PF as my first win T6-T8 with JP PUG..

EN players who lack of knowledge about the content & dont want to use google translate for communication purpose often ruined the JP PF for those who put comment 'ready to clear it', that's what made some of EN players leave bad impression for them.

If people dont know anything about the fight, study the JP strat first or their video on youtube (there's a lot) and the most important thing is join their practice party..at least you know what to do. I had a friend who well-skilled for this game but he refused to join practice and enter any JP PF without any knowledge from said content...in the end he kept getting kicked in just few rounds. He always asked us what to do once inside the party and doing the content, that was hilarious. Hows most the JP well mannered to each other but EN attitude force them to put 'JP only'.

I don't say all EN are bad-mannered players but some of us. Even thought GoogleTranslate often make awkward sentence, i made friends with them (JP) and rarely talk but most of them polite enough to ask for help when they need. But what people said on this thread are true enough, without static it'll be hard to clear some of end-game content. I might move to other server also someday (tonberry probably )