加入某个阵营之后接到的任务，其唯一作用就是给你退出该派系。毕竟一个存档只能加入一个派系，仅仅只是方便你后悔了想改投其他派系的时候提供一点便利而已。
The faction quests you get after joining are only for quitting that faction. Since you can join just one faction per save file, they basically just let you regret and switch—convenience feature, really.