,,Colour is a key affordance, and this font only makes it easier to achieve a good UX.''

What mono color setting of the doughnut emoji makes it easier for my old mother to recognize the doughnot over showing one with multiple colors?

How does being able to specify the color for the empty / non empty battery symbols make it harder to achieve bad UX? At this point making it hard to achieve bad UX by UX designers should be preferred over making it easier to achieve good UX, as designers don't have the capability to do user testing on a huge variety of people.