I know it may take some storage space but voice acting definitely adds a better experience while reading. You can feel any kinds of scenario on a new level, I remember I got goosebumps with Qu's voice acting from extra story chapter of Kowloong.
Voice over on the story may entertained the newbies as well. In order to keep them from continuing playing the game because some of the newbies just left the game without even finishing chapter 8. Their reason is "it's too boring"
