Because it is. Full voice acting made TOR so much more enjoyable than if it had text-only during quests and cutscenes. But I guess there's people like you that don't like voiced cutsices since they just want to skip them and get to killing those 10 crabs quick.
And really, this is obvious of both screenplays and books. Good writing is about writing about what is interesting, rather than what is mundane. Voice acting in most games refers way too much about the mundane.