All I know is that if I have to choose a color from a color wheel of primary colors I'd choose violet over yellow because (again if I HAD TO choose) I get sick of looking at yellow more quickly than I get sick of looking at violet.
To me, yellow is associated with only a few things: The sun, yellow flowers, and then a bunch of not very appealing things. Violet and shades stemming from it, rooted in it, seems to me to have more potential of "spin-off" colors and shades. It can "blend"/"morph" on one side into blue (pretty much my least favorite color in its "primary form" and anywhere too close to it), and into red on the other side (a color that, to me, is only accepted in very limited doses/uses, but "on the pink-tones side" of red are among some of my favorite colors.
Depending on its use, violet (the primary color) can be a vibrant and happy color or else it can be mournful. White can help violet. Black tends not to.
I pretty much think yellow should never be anywhere near violet - ever (and that includes the "use of" violet in pansies that are a mix of violet and yellow).
In typing I find "violet" may be the word that I have the most trouble typing without discovering that I've thrown in an "n" to after the "e". I think that's more a typing thing than anything else, although it might make one wonder, I suppose....
The primary color, violet, to me offers more room/potential for shades/tones that I like. I don't know.... To me, blue is common. Green is common. Yellow is either the sun (good or too much, depending) or else it's flowers (sometimes commonly, flowers - if that makes any sense). All colors and most things are, to me, acceptable in/for flowers (even, when it comes down to it, those yellow and violet pansies that are not particularly my favorites but that I like even so).