No, clearly people are not flocking to this game because "Finally a game without voice acting and modern presentation!" People clearly like it for combat and for the world Larian build and for their nice production values. Adding VO and/or cinematic dialog would do nothing ot change these elements at all
It adds time, money, and doesn't have the flexibility that plain text does. I understand you wanting these features that exist in modern games, but that sorta stuff is the same bloat that got us here in the first place. You add stuff like this, something will be sacrificed for it.