That rather conflicts with previous Fallout lore. These type of robots are not suppose to be capable of developing self awareness, because they simply do not have the hardware or the software for it. At best they can simulate human like behavior and responses because they are programmed for it. There is not some kind of hardware or software block that prevents such robots from developing true personalities, a safety feature the designers put in. The hardware is just not capable of it. Brainbots could to a degree develop personalities because they use brains instead of the limited Fallout universe processors. They are conditioned with CODE to stick to their programming, but can overcome this. True fully mechanical AI in the Fallout verse requires so much hardware that it fills a room or more.