With real voice actors, we can direct them to say their lines with more sadness. Or guarded desperation and struggle, on the verge of crying but clinging to hop

With real voice actors, we can direct them to say their lines with more sadness. Or guarded desperation and struggle, on the verge of crying but clinging to hope... etc. This kind of subtle direction is not possible with artificial speech. For narration it can work. But for dramatic character acting in animated films, the results make the characters sound like terrible actors. More granular control is needed over specific words, syllables, tone, emphasis and timing.