Of course good voice acting adds to the game, I can't imagine anyone honestly saying it doesn't. that said, there are a lot of other issues around it (for me at least). First, the protagonist. with a voiced protagonist, you have to be very careful how they're voiced. If it's not done well, it can lead to people hating their own character, which is about one of the worst things you can have. Well it's done well it can work, but again, it limits role playing options. As GM4Him was saying in another thread, when your main character is reacting a certain way to a situation either by voice or expression, it limits how you can interpret their response. if my character sounds scared but i want to role play them not being scared at all, it takes more effort.
Second is the amount of dialogue. Despite the modern trend to think that all voice all the time is the only way to go, i think it's very clear that for anyone other than the biggest studios, having hundreds of thousands of lines of dialogue and having them be entirely voiced well is a massive undertaking and could increase the budget of a game many times past what they were hoping for originally. You can see the different if you just look at BG3 and WotR. in BG3 voice acting adds a lot, but the conversations are often quite brief. In WotR, you'll have key moments and conversations being voiced, but a lot of the extra information gathering bits are not, and that leads to a massive amount of extra information that can be given to the player.
For me, I'd much rather have a game where the important parts are voiced but there is still a ton of non-voiced text over a game where it was all voiced, but there was a noticeable lack in the length, variety, and number of conversations
