the fact that it’s based mainly on typical facial expressions. An angry looking face means angry. You can delve into the “That image actually comes from an interview this guy did and he’s reacting to someone who said something stupid” He looks like he’s exasperated, and that image means “I’m exasperated.” It’s readable the way emoji are.

It’s living through the evolution as well. New rage faces would get added and new memes would flood all social media. Jackie Chan would get rage face’d and a new flood would start.