I get how someone who is not used to it might find it lacking, but I can only say that ever since Bioware decided to voice its protagonists the dialogue became much more restricted. It boils down to what do you prefer, read a little (really not too much, you wanna see a lot of reading check out Pillars of Eternity), or lose a lot of story. Voice acting in general means less story (but today it's already a done deal, even obsidian added voice acting to poe2), but to voice your protagonist (especially if you have more than one voice set, and here you have something like 4 so you need to record all the lines four times) is too much work and it's not worth it.
Also, Larian already uses the protagonist voice sets for the dream boy/girl voice, so they already need to record her/his lines four times, and even this seems like too much work
Its not just 4 voice sets. Its at least 9 because the 5 companion characters can be selected to play as the protagonist. I really can't see Larian adding fully voiced protagonist . . . but there is some limited voice work scattered through Act 1.
