As folk have argued in this thread, a dialogue tree that is designed to cope with fully voiced protagonists is probably going to have to be less complex than one where this isn’t a consideration, in that dialogue choices are probably going to have to be more restricted to avoid the cost and effort in recording lines being prohibitive. Yes, the number of options is already going to be limited by the need to record NPC responses, but this would be a further constraint.
If this is right, and I think that to some degree it must be, then people who don’t want voiced protagonists but do want lots more options to express their custom characters are going to be negatively effected even if there’s a toggle to turn voiced dialogue.
Whether they decide to have full pc VO or not, I doubt they would redo dialogue tree design at this point in development.