I speculate it's to monetize specified versions of their product to market it to different industries and professions. If you have an AI that can do everything well you can't really expand that much. You can either charge a LOT and have a few customers, or a little and have a bunch of customers and nothing in between. Conversely, by making specific instances tailored to different fields and professions, you can capture big and little fish. Just my guess though, maybe they accidentally made Skynet and that's the real reason!