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12bit means that the voltage range of a photosite (normally from +0 to not more than +5V) is digitized (A/D conversion) in 2^12 levels wich means 5V/4096=~0,0012V in the best case.
Such a value is so little for a sensor that starts to be very difficult to distinguish from each digitized value to others, expecially when the surface of a photosite is smaller than a bacteria.
14bit means that the voltage range is divided in 16348 (4 times smaller than 12bit)
Going ahead in this way means that a 16bit A/D converter in the specification is surely cheating, and 24/32bit is nonsense with current technology.
IMHO a RAW file with 16bit per color is enough for the next 5-10 years.