It would be neat if you could express colours as a mix of arbitrary base colours, kind of like you’re mixing it on a paint palette. (ROYGBIVWK maybe? K being Key/blacK)
r2b1 gets you a deep reddish purple, but if you want it to be lighter you just keep adding white, r2b1w1, r2b1w2 etc. You can just focus on chroma, and mix in white/black to futz with the saturation/lightness. I feel like that’s a bit more like the way people talk about colours. (Pale yellowish-green = y1g2w2, dark blueish-grey = b1w2k4)
The way paint colours blend gets a bit complex compared to mathematically perfect RGB light sources, and there’s obviously MANY ways to represent the exact same colour, so not a silver bullet by any means.