>>149955720
Well for one in real life when observing people specific colors on the face tend to appear in the same areas, but since were dealing with cartoonists they can exaggerate features and instead of a subtle red being used they just place a block of red.
Also from an animation perspective if you use the same block of red for a nose you dont have to worry about drawing an actual nose in perspective since that can block can shit from one angle to the next and be consistent. Watch Over The Garden Wall, thats like the most obvious example I can think of.
I dont like it either but thats the logic behind it