That is what I tell myself when things don't work out, and I have to rip apart the work I've done. Like this hat.
I planned black and pink; then convinced myself that charcoal and pink would look better - more current, softer, etc. That might have been true looking at skeins of yarn, but it certainly is not true looking at the pattern as it works up.
There is not enough contrast between the colors, so the pink looks garish and the grey looks pale. In person, it also appears oddly blue up against the pink, which it does not seem at all alone on its skein.
I am going out to buy black yarn now.