It would take a brave chef to sneak a chilli into a traditional Cantonese dish! The locals like to taste what they're eating. I spent a couple of years in ChangSha and sometimes wondered what the chef was disguising with chilies. I got the impression it was throw in some chilies and that'll make it a traditional 'hot' Hunan dish.
In England we're spoilt with Indian hot and spicy curries, a good Madras makes a Hunan chilli dish rather tame!