adding hue shifts isn't about making something look realistic, its about adding that 'extra' level to your work, it makes a winter scene feel cold on the eyes, and a fire feel hot.. It adds warmth to a characters skin, it's simply foolish to not take advantage of what using the whole spectrum can bring to the quality of your work.. whether your excuse is that you want to make cartoons, not realism. Look back to the first 'cartoons' made, great care was made to bring real art to life through the discovery of animation, what your basically saying is 'yeah but I just want to be lazy'..