[michaelt]

I suspect the price point the Raspberry Pi targets isn't easily compatible with a truly high quality camera.

As I understand things, the Pi has a single lane of CSI at maybe 1.5 Gbps. That's enough for 1080p video, it's not enough for 4k video.

A high-end smartphone, on the other hand, has more like 5 Gbps of bandwidth to the camera, and the processing power needed to deal with that much data. But the device cost is 10x what an RPi costs, so they can afford it.