There's a big difference between being able to control the color accuracy of a printed piece which gives you an analog representation, versus digital which should have, but doesn't have much accuracy control at all. Cell phones can do some amazing things with their small cameras, but not all cell phones are alike, and that's the majority of the cameras that are going to be used to take photos nowadays. All cell phones process the color and light dynamics before you see the image. Some allow you to see the image in raw format without that processing, but doing your own color adjustments on a raw format image isn't something that the average person knows about. Most don't care either, it's just point and shoot and that's good enough.
Once the phone has it, now there's different methods of storage formats that can be used to store it, which can change things slightly. Then you have the device it's being transferred to, usually a computer, that has its own processing it does on it. From there it goes to a web browser, all of which also have their own methods of handling color, and after all that, people see it on whatever device they're using to view it. Those devices also have their own methods of processing color and they're not all the same.
The advantage of digital is instant gratification; point, shoot, upload, worldwide distribution within minutes. True color accuracy is the compromise, but for most people and in most situations, that's not a big deal. For true color accuracy, there isn't a truly accurate, reliable single standard of handling images and color across all these devices and mediums of representing color at this time. Hopefully in the future there will be a much closer method that's universal, but for now, everything digital is an approximation. They can be good, sometimes very good, but it's the consistency that publishers don't have control over, like they do with printed materials. Printed pieces are also expensive, and that's a factor too. I had a graphics business for 15 years, and on the wall I had a sign that said "Time, Quality, Price; pick any two". That reality is still true today.