Simple flowers, simple cookies, simple plate, simple awesome goodness. How many of these do you think I can fit in my mouth at once?
Traditionally in China, moon cakes are given to coworkers and families as traditional gifts and shared among several people with tea. Despite the 1200 calories per cake, I'd have a hard time sharing. Maybe it's a good thing I'm not Chinese.
It's hard to bring something to a BBQ that people will like that's still simple and quick to throw together. Throwing a few bits to fruit onto a stick is pretty much as simple as it can get. And who doesn't like a rainbow! You can dress up that boring buffet table covered in potato salad and baked beans!