Hollywood script writers write for actors who are trained to and indeed sometimes do employ facial expressions, postures and gestures associated with human emotions to compellingly, or not, portray roles. Viewers of those productions depend on such cues in order to follow the sequence of illusions in something approximating the narrative mode.
HAL is your AI, and successful in the film because it is not physically realized in a form that can be anthropomorphized.
If you did write a role for that emotionless AI, would you really want to put it in a physical form approximating a human body? Once we want our AI to interact humanly - with facial expressions, gestures, subtle and dynamic verbal - and otherwise than verbal - language, and design it a body, does it not stand to reason that we will also want it to use that human body with in the manner, and with the mannerisms, of humans?
A "realistic" "hard" AI would be nothing like a well socialized human, for it would have very constrained, and fundamentally different, input and output functions, than a human, and likely entirely unrelated reasoning, modeling and motivating mechanisms.
I suppose. Two cents. Interesting article. Thanks for the ideas and forum.