What indication do you have that China doesn't design their own stuff?

They have their own Google, Facebook, Amazon, Microsoft, consumer electronics, car companies, aircraft carriers, chip companies, manufacturing, etc.

glad to see you people think this way

They actually do. Many of the things you think are designed in the west are actually designed in China but with a western logo slapped on top of it. The western companies are mostly just choosing what Chinese designed parts they want and maybe change the plastic enclosure for a unique look.