It's odd that we don't have the custom character voiced in dialogues, but they are voiced in interactions with the world, perception checks and the like... why get to chooise a voice option if it's not gonna be used in dialogue?!
I imagine it's similar to BG:2, your companions had blocks and blocks of text with you but only the first line every so often was voiced, so you knew what they sounded like, to set the mood, and to add to especially dramatic moments. ....Also to save all that time and money on all that VO !!
Especially with all these people complaining about there only being two voices for each gender, make what there is sparse and you don't spoil the immersion. At least in theory
