Well to answer at least your last question, which is about all I have the energy for at this moment. A color appearance model uses some inputs about a stimuli to predict what it looks like. Munsell is not a color appearance model because it’s just a list of XYZ values under a particular illuminant (single state of adaptation) and a list of corresponding value, chroma, and hue numbers. Maybe you can interpolate within it. But it doesn’t have any adaptation model attached or describe any mathematical functions to descrive the relationship between the physical parameters of the stimuli and the appearance values.
And in your own words, and in your own examples within this thread, “CIE Colorimetry” isn’t an apperance model because the same colorimetric values can look different depending on context. Like state of adatpation or relationship to other elements in the scene.
I’m not going to suggest that CIECAM is a “good” appearance model because you rightfully point out it is missing things like simultaneous contrast and “filling in” but at least in includes luminance adaptatiom and chromatic adaptation. And is actually a “model” in that it provides some mathematical proceedures for calculating appearance correlates.