It must be the combination of the complex, dynamic shape, and our high sensitivity to hands that look ‘off’. There are many other things that are hard to draw

It must be the combination of the complex, dynamic shape, and our high sensitivity to hands that look ‘off’. There are many other things that are hard to draw accurately but where we are completely convinced by very cartoonish representations. That gives hands a very wide uncanny valley that is hard to cross. Surely this is because hands are one of the most versatile and useful parts of the human body? We probably have a lot of brain cycles dedicated to modeling them.