The content is... AI assisted (maybe a better way to put it).
And yes, now you don't need to get the VA every time you add a line, as long as the License for the TTS data holds.
You still want to be having proper VAs for lead roles though. Or you might end up with empty feeling dialogues. Even though AI tends to put inflections and all, from what I have seen, it's not good enough to reproduce proper acting.
Of course that would mean that those who cannot do the higher quality acting ^[e.g. most Anime English dubs. I have seen a few exceptions, but they are few enough to call exceptions] will be stuck with only making the TTS files, instead of getting lead roles.
But that will mean that now, places where games could not afford to add voice, they now can. Specially useful for cases where someone is doing a one dev project.
Even better if there can be an open standard format for AI training compatible TTS data. That way, a VA can just pay a one time fee to a tech, to create that file, then own said file and licence it whichever way they like.
As a treble lover, I tend to have problems with low bitrate and lossily compressed stuff.
But from what I have ~~seen~~ heard, as long as the quanta are fine enough, the resultant regenerated audio tends to be close enough to the original. Of course, the components of the sound card matter, when you get to extreme clarity levels, but I guess my ears are not fine enough for that.