Photographically this is a very contentious subject. I've done pro color consulting and had to understand all the principles and lingo etc. There
are good color theory books out there. In the real world it's based on the limitations of your chosen medium. But the psychological effect of
color is quite complex, and not simply related to how saturated certain obvious hues are, but about color interrelationships, balanced, modulation in relation to neutrals, etc. Sometimes less is more. But nowadays it seems all that people know how to do is use Fauxtoshop to
add honey atop jam atop sugar cubes, until your taste buds either go numb or you vomit.