Probably because when they do, it looks like this:
Pictured above is a traditional Chinese dessert. It is a thick soup, served hot, made from lightly sweetened black sesame seeds.
It tasted good, but I just can't be convinced that soup is a good idea for breakfast, much less dessert (the most important meal of the day).
Here's an image of a special treat at the Beijing Starbucks: a Red Bean Scone. I had to try it.
This next picture isn't a dessert, but it is one of the weirdest things I have ever been served anywhere in the world.
Ladies and Gentlemen, I present to you: Sea Cucumber Porridge.
The "porridge" part was actually quite tasty. The sea cucumber, on the other hand . . . Well, it tasted like an ocean-flavored piece of rubber.