capnpea:

The interesting thing about Glados/HAL 9000 parallels is that

Hal was conceived at a time when artificial intelligence was more of a fictional construct than a practical possibility. Hal is introduced as humanlike because the audience is familiar with and comfortable with humans, but they aren’t familiar with or comfortable with living computers. It’s when he starts acting robotic and calculated that the audience realizes “oh no, he’s a computer” and he becomes threatening.

By the time Glados was conceived, we had become used to computer automated systems. Synthetic voices offering us information is something we encounter in daily life. Glados is introduced as a computerized preprogrammed voice because that’s what the audience is familiar and comfortable with. It’s when she starts acting human and emotional that the audience realizes “oh no, she’s alive” and she becomes threatening.