First few games on JP I actually saw 95% DPS jobs on the post game stats. Over time I did see some cheesy healer or tank stuff but a lot less than NA honestly. Can't get away with half the stuff I do on NA or OCE in the JP games so yeah there is some kinda difference. The 4 man tank team I played with themselves said something like "Uh well we don't know if JP does the 4 man Dark thing but...." I definitely get pulled in and stunned and destroyed by tanks on JP but do I see premade tank or healer groups at the top of every game with 3 to 4 mil damage? No at least not so far.