the issue is that a voiced protagonist severely limits dialogue options and makes it harder for the devs to adapt and include new stuff as the process goes on.
Even with non-voiced protagonist the issue exists in form of NPC VO and cinematic presentation. Sure recording several Tav/Origin VOs is an additional expense/scheduling problem, but BG3 dialogues are already costly to expand.
I also see Origin system to be a far bigger issue in how Tav's lines are written than potential VO. BG3 is so far removed from what I would consider an ideal RPG, that at this point I would rather have than commit to what they have. Giving BG3 full VO pits it against Witches, Mass Effects and Inquisition, which is a much more favourable position to be in (as far as RPGness goes). Also, dominating the market through sheer production value seems to be Larians main strategy at this point.
