Why weight changes what you need from color
A light-weight serif at 300 weight on a warm cream surface reads as elegant and airy. The same typeface at 700 weight on the same background can start to feel dense and claustrophobic. This is because optical weight amplifies perceived color saturation. Heavy strokes draw more of the warm surface color into the eye, making the palette feel more saturated than it is. That means a palette that works under a light type stack needs adjustment when you shift to heavier weights.
