OK, it looks like I eventually found my own answer: it's because the cells have a "full well" capacity limit in practice...
But that's not really true, because you could just record the whole value at the sensor. So it's not _really_ DSP reasons...
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... it has to be some other reason, like the readout can't handle more bits or something?
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Know what I mean? It's like saying "you have to set it because the low 4 bits are noisy and you might not want them".
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