Coming from the other side of this, I've had a good narrator sell me entire series in the past. The Grim Noir Chronicles is the first that comes to mind (idk if anyone remembers the terrible sitcom Perfect Strangers but he played Balki and in real life he has a buttery smooth baritone voice that I just adore) and anything that Soundbooth Theater touches, partly for Jeff Hays and partly because of the full-cast adaptations they do that feel like old school radio plays to me. I see no reason to use this over existing text to speech features. If i just want to mechanically turn patterns of light into patterns of vibration there's non-AI tech that will do that for free, and AI narration doesn't do what human narration does yet.