Maybe a good balance could be a human voice actor for main dialogue, supported by ai trained on their main dialogue to voice sidequest and deep lore dialogue. It could enable fully voiced dialogue-heavy games that would otherwise be too expensive to produce, something like generative RPGs or Morrowind, if all the books could be voiced, and more easily translated while remaining fully voiced. But keeping humans to fill the main campaign contributions, emotional beats and determine character personality. I’m just comparing Morrowind to Oblivion, which was voiced, but the dialogue and conversation trees were heavily reduced in volume as a result.