THEY FOOD WITH THEIR BARE HANDS!!!!!!!!!!!!
Firstly, it has been proven1 that the tactile stimulus from the hands actually enhances the experience of eating. According to Ayurveda, digestion starts with the fingertips. As someone who has lived that lifestyle for several years I can personally attest to the fact that food tastes better when eaten with the hands.
Secondly, it's more hygienic than using forks/knives/spoons. Think about it, it's obvious.
Thirdly, it's more practical for whoever serves the food.