Wow. Marcus' answer is certainly correct, fundamentally.
Intensity (chroma, saturation, whatever) is, (like values) an extremely finite range on the palette when one compares it to "nature". Controlling color/value relationships within this compressed range is how the painter is able to create an illusion. That said, mastering that "control" is the sum of the painter's problem, and there are many varied paths to achieving it.
Regarding "problem solving for painters" . . . who's the author? I agree with #1. I think the other "solutions" are nebulously phrased and could cause more problems than they solve.
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