They only target to appeal KR player base. We liked XE combo counter (atleast in EU, but pretty sure it would have been welcomed in NA), but KR didn't so nexon removed it. We liked 8-man raids, but KR didn't so nexon removed it. We liked OS, but KR didn't so nexon removed it. We lived long without fatigue, but KR always had it so nexon added it to us too.
Buffs/nerfs on characters? its based on data KR players gather, and how well/bad they play these characters, we don't matter for those.
New outfits? based on KR tastes. If KR people like huge boobs they will keep adding volume up outfits.
Enough said, you get the idea.
@Abaddan
My question would be how did the people show Nexon how to optimize their stuff without looking at the actual source code because I highly doubt that Nexon would allow people to look at their source code? Also isn't there a recent rebalance patch in Korea that rebalanced Lann too? Or was it just bad?