As much as we would want it, it's simply impossible for many reasons, like the massive scope of the game (it would simply be too expensive to hire voice actors considering how many lines of dialogue there are). But it's primarily the game's logic that makes it impossible, due to things like the player character talking a lot (which would require at least 2 voice actors), the player being able to choose a completely custom name that's said by several characters, the fact that the characters that show up in different situations aren't predetermined (they can be randomized, chosen by the player, etc), just to mention some hurdles. The only way to get voice acting to work in this game would be to use AI voices, which we do not support.