I think the other piece of it is that we are so connected to how hands should look and move. So when they look off it’s immediately apparent. If you look closely at any part of this picture it’s definitely off. No plaid looks like that )but it should it looks great, that’s not what real knitting looks like, the buckles aren’t quite right, the strap kinda wraps behind the neck more than is natural, the hair, eyes chicken face are all a bit off. But hands being a little off appear super off and the uncanny valley of them is steep and wide, so not only is it worse at them but there’s an anthrocentric (if that’s a word) issue with them too. If some other creature looked at ai of itself it might notice something off being more disturbing that would pass unnoticed to us.