sims 4 said a color would be too complicated, however a hex dialog box is pretty much between a color wheel and the swatches they have now. it all allow simmer to be able to have more colors and if you the hex dialog box across colorization platforms then all the swatches will be matching
here is a link to the dialog box:
another hexagon color picker:
Comments
BTW if we ever get a colour wheel I think it will be something like this. Personally, if I want to recolor something I usually just use Sims4Studio and Photoshop.
Okay if not Sims 4 then Sims 5 depending on patch priorities they have and the demand for it to be change. However they did make it possible for us to have house traits and be able to gender-less clothing,hair etc.
It just may take some more time.