I can almost guarantee this is due to licensing issues with the camera firmware. Modern cameras aren't just hardware any more. They're a mix of hardware and advanced processing algorithms that really do make a huge difference in the final output. Those algorithms are often licensed from 3rd parties with specific licensing requirements.
Sony has been reasonably good about enabling open-source and fixing these things in the past, so I'd give them the benefit of the doubt that they'll try to find a way to enable the cameras on unlocked phones in the future.
Sony has been reasonably good about enabling open-source and fixing these things in the past, so I'd give them the benefit of the doubt that they'll try to find a way to enable the cameras on unlocked phones in the future.