Chopsticks are far more practical once you can use them. You can make them from bamboo very easily. The areas that use chopsticks all seem to grow bamboo too. If you use chopsticks, then each family unit only needs one cleaver/knife, and they can make an infinite number of chopsticks. If you use knives and forks you need mines, blacksmiths, factories etc, and everyone needs a knife.
Petit pois/peas aren't really seen in asia, they go for mange tout. The peas in fried rice here are just for colour, its back from when it was hard to get spring onions.