ive never understood why we have 3 red hairtones but no desaturated brown. and one quite simillar grey and white swatch that could have been one white and one grey streaked red for my old sims. the choosen swatches seems unoptimized in terms of colors and player maximized choice.
my ideal would be:
make one red (maybe the reddest red) swatch into desaturated brown
make the yellow hair swatch into a strawberry blonde
merge white and grey swatches and make the freed up hair slot into a grey streaked natural red.