The RGB model that is currently used (sRGB) is just an emulation of CRT-displays, it is not how human vision works. There is not actually much conceptual difference between red and yellow.
The model is irrelevant to my point. E.g. Lab and Cieluv may become obsolete if it turns out that we can remap "the bindings between color and wavelength" in our brains as easily as "the bindings between color and wavelength" in our vision libraries. The fact that purple doesn't associate to a wavelength should be a clue that binding the two at all is a mistake, not a clue that purple is exceptional.