I think maybe it sounds worse because it's based on a more accurate and complex modelling of the human voice, so while it sounds worse now, it has the potential

I think maybe it sounds worse because it's based on a more accurate and complex modelling of the human voice, so while it sounds worse now, it has the potential to get better and perhaps surpass implementations using more widely used methods. Can the voice synthesis method used on Android sing, scream, or make other sounds that are not speech?