Make it possible to mix color and image swatches
For instance. You might have a t-shirt in some different single colors like black, white and green. For those you use color swatches.
But you also have the t-shirt it in melange gray or striped in two colors. For that you can use image swatches.
Now you have to use image swatches and create images for the single colors. It would have been much easier to use the color swatch for those and the image swatch for the others if it was just possible to use both types of swatches on the same product.