I actualy like how it is right now ... and honestly hope it will not change. :-/
Even curent state is in my eyes honestly slight downgrade from what it was in
FIRST gameplay presentation, where specific lines we have now, was only common sentences describing what the sentence we say is about ... but dont give us the sentence itself.
I would understand that some people would find it odd at least ... but i like that when you were persuating someone, you could imagine your character say litteraly anything you want, instead of what Larian come with. :-/
But back to voice acting ...
For one i dont see much reason in voicing the exactly same sentence i just read in my mind ... the only situation where voice acting makes sence is when picking single dialogue options sets in motion several sentences on both sides ... but as non-native english speaker, or more like even non-english speaker, i kinda often pick some answer not fully understanding the meaning behind that, and then drop my jaw when something totally unexpected happens (especialy frustrating in games like Vampyr, that are autosaving after every decision in dialogue and dont support any other way of saving your progress -_- ) ...
So i gues i dont need to say that i find this system as worse shit BioWare ever invented (or popularized w/e) and really hope that Larian will never go that way.
For two, you need to understand that voice acting is actualy INCREDIBLY expensive ...
And honestly i would rather see litteraly anything else implemented, than this. :-/
And finaly there is that thing i did mentioned in first point ...
As you probably know, if you are talking person ... saying single sentence is possible in several different ways, accent, expresion, tone ... all that and much more are "integral part of the communication" ... and by voicing the sentence, they all are set and cant be moved. :-/
If you would like to make fully voiced character, you would need to record some mocking answer, some benevolent answer, some cruel answer, some ignorant answer, some fun-making answer, ... and i dunno what else ... for every single sentence you will be told by every single NPC. :-/
And even then you would have only single voice prepared.

Imagine if you want to give players at least 4 per gender. :-/