Have to disagree here. This is just Nexon giving people what they want. It's all power fantasy. If players wanted party play badly enough, they would party regardless of it being slower or faster.
Given a friend playing the same game as me, I always party, even if there is absolutely no reason to.
Nexon might be the one not changing party play, but we are the one not giving them a reason to. (Probably more KMS than GMS)