It *is* an either-or decision though, albiet not in the way you're thinking.
The game's budget is a 0 sum, so if money is diverted into giving 10 (assuming the 4 existing player voices and the playable npcs in early access are all there is) that's going to have to come from somewhere else. I'd rather Larian spend that money on fully voiced player voice acting on new maps, spells, monsters... stuff.