It's physics that restricts further development of CCD technology. Here's how.
Link 1. contains graphical (scroll about 1/2 way down) comparing the quantum efficiencies of CMOS vs CCD sensors. QE determines the sensors sensitivity to light. It affects the signal component of the signal-to-noise ratio.
Link 2 summarizes the history of image sensor development and discusses the physics and engineering behind the superior signal performance of CMOS devices.
Link 3 is a technical review in a peer-reviewed academic journal.
Of course the CCD vs CMOS physics is
irrelevant compared to the perceived, and therefore authentic, preferences for the M9 data stream's rendering. Life is much too short not to own and use technology one prefers and values.
Consumer expectations are also relevant. Many consumers choose convenience (high signal-to-noise ratio and dynamic range along with the option to record video) to color rendition characteristics. These are objective factors that can be measured and evaluated. However they don't necessarily define the value-added nature of a brand. Each consumer evaluates the value-added benefits for themselves.