From what I understand, Moses's major contribution was describing color mixing principles for pigment paints independent of the notion of specially nominated primary colors, showing among other things that a mixture of any two paints is reduced in saturation in proprtion to their separation on the hue circle. I've been exploring classic color theory texts lately and the most illuminating by far as been Michel-Eugène Chevreul's "Principles of Color Harmony and Contrast", which has a wonderful recent translation and commentary by Dan Margulis. The core of the work elucidates what are known today as the optical phenomena of simultaneous contrast, chromatic adaptation, perceptual constancy. There is also a good overview and critique of historical color wheels at
https://www.handprint.com/HP/WCL/color14.html