I think they are, given that Vesperia's and Dawn of the New World's skits were voiced. Edit: Yeah, it was confirmed.
Even with the implementation of Groovy Chat, they'll come across better if they were voiced than silent. Playing Tales of the Abyss 3DS with silent skits is really weird after having experienced voiced skits in the JP games, lol.
BTW, kayos--if you want, you could put a little something about Groovy Chat in there since it's kinda new (even if it's expanding on Destiny 2's skits), and they usually happen around save points anyway. If you need help with text, let me know but going by your post, it seems like you have it all taken care of already.