For example, I would imagine you could come up with a more perfect list of what the "pastel" color is for any given hue. Another example I remember from my early 00s UX days -- if you take a gradient-based glass/glossy bar that is blue and try to hue shift it to red, it won't look properly glossy without tweaking the relationships between the colors in the gradient. Having a perfect understanding of how our eyes perceive these types of color differences I would think could yield a perfect approach for transposing visual phenomenona between different hues. I have no idea though I'm by no means an expert on this.