Tangential note: "robotized" voice should always be preferred to realistic human-like voices, to reduce alienation of people exposed to them.
I think that using unrealistic voices, traits and so on for software output should even be mandatory by Law.
The anthropomorphization of things is just a way to alienate humans, to train them to emphatize with automata that other humans control and reduce their ability to emphatize with their similar, reducing their ability to aggregate in groups and eventually fight together.
Divide et impera at individual level and large scale.
Cui prodest?