I personally prefer a silent protagonist if it's "my" character. Like, I would prefer silent for Tav, but would be happy with a voiced Origin character, except that it would probably be prohibitively expensive. I prefer more dialogue options to voiced main characters, by a lot.
For characters like Tav, I find having voiced lines to be frequently jarring. The tone frequently comes out a bit off to what I imagined. It in fact winds up sometimes breaking my immersion, and I don't get anything out of it. It just takes longer for the scene to happen, since I have to listen to the voice work on top of reading my selections. Consider how people already complain about their Tav's body language in some scenes, like that they don't like facial expressions in some scenes. There are complaints that Tav looks too romantically at Gale in his weave scene, or that they don't look upset enough when a companion is going through something traumatic, or too upset if the Tav doesn't like someone. The facial expressions work great in those scenes for certain Tav's but horribly for others. This tone thing is not an issue for characters I don't control, because I can't control others' tones IRL. I do prefer voiced NPCs, but I can enjoy games without that. Unless there are multiple voice options for the PC, it also limits the type of characters you can create.
Even if there was a setting to turn off the voice, it would still need the budget to create it, which I would rather be spent on more content, bug fixes, etc.
