You have to have PC voice in your interactions with other characters.
You don't.
This might be a generational thing; I grew up with protagonists that were usually limited with their lines (remember CDs?) and I hate voiced characters, and if they are voiced, I want them to be very, very barebones and easily modded (read: like BG1 and 2) because this allows me to have a voice made for the character. When my protagonist is (almost entirely) my dwarf can have a jamacan accent, I can have my elf or halfling sound like Barry White. When playing other games with voiced characters like Mass Effect, I can't imagine Shepard is originally from India, or Burhma, or Africa. Having Shepard voiced actually locks you out of roleplaying, constantly reminding you Shepard is from the american continent. This is completely ignoring the logistics involved and extra hard drive space all this would require. My point is, you might like having it but for me if the character's voice is preset, that's a Very Bad Thing; the first thing I do when making a custom character is imagine what they look like, and immediately after what they sound like. To me if your character is doomed with a preset voices you may as well junk the character creator entirely and have set characters; ie, play the preset characters like Gale or Wynn or Asterion, like you can in Divinity, though you can ofc customise their appearence too.
Dude, I hate to break it to you but I am 50. So it probably isn't a generational thing. I grew up with the same type of games, but that doesn't mean I want to be locked in the past with them. I mean not everyone wants to do a make believe accent in their head. That is great for tabletop but not a modern AAA video game. Not to mention, you don't want a voiced protag that is fine, they can always have a setting in options to turn voice off. Your comment about junking the character creator and just playing an origin player because of voice goes against practically all modern RPGs. If you don't want voice, I can understand that, and you could always have an option to mute the voice. But I am not saying to you well I don't like silent characters so absolutely don't do it am I. It is not like it is an either or decision here. A PC voice is something that can easily be disabled, and you would also still benefit from the custom facial animations when he/she is "reading" the lines so you can use whatever voice in your head you fancy. Either way, it would be a better presentation of the PC rather than the stiff, crappy facial animations it has now.