In the same way as traditional BYR is rich & narrow in gamut & modern CYM is vivid & wide in gamut. I see that RGB is Rich but narrow in gamut & its mirror CGM would be more vivid & wider in gamut
We use 3 of those 4 schemes regularly now for digital, paint & print.
But I predict that in the same way it took us a long time to see the benefits of CYM (in CMYK printing), we will eventually find technical uses for CGM in the additive light mixing or digital space.
It feels both visually intuitive from UCT's model & technically under-explored.
In Phen Theory (the parent theory of UCT) it proposes that Green is actually a polarity of Yellow. Meaning they are positive & negative versions of the same "colour primary" with Green being positive & Yellow being Negative.
This explains the presence of additive & subtractive colour spaces as can be see in the UCT model's top white/additive pyramid mixed from light "Non-matter" & bottom/subtractive pyramid mixed from "Matter" (chemicals, dyes & pigments etc.) forming an overall polarity for the structure & 2 realms of colour mixing.
All this leads me to propose that CGM being composed of all the "Positive" polarities of the primaries (C=B+, G=Y+ & M=R+) is the future of digital display & lighting technologies, being able to produce the brightest most vivid & widest colour spaces & schemes.
CGM will be the King/Queen of Colour Spaces!