I totally agree with your second sentence, that it makes the game more believable and (at least for me), and BG3 is such an amazing game thanks to their character cast.

However, why would it be dumb to make such a mod? Sure, it’s not something I’d use, but it’s actually a pretty cool technological feat, given the voices and everything, and it allows you to finetune the game to more fit your preference or fantasy. RPGs are supposed to be about living through your fantasies, and having fun. It’s a single player game, why shouldn’t people tailor it to their own specific needs and wants?

Of course, if they are being a dick about it, and spewing their bullshit propaganda in the mod description, the I’m all for just banning it.