I'd love if grimoire had voices for dialogue parts, but I understand why not. From a lore standpoint, it'd spoil the mysteries of who's saying what. If you hear a voice in a card that's labelled (for example) as Dredgen, then you'd recognize it in an unlabelled card. So the mystery would vanish (on the bright side, it'd settle the Jaren is Dredgen or not debate). On the business side, voice actors cost money and not worth it to read a small few paragraphs or lines.