There is an interesting twist on the usual state of affairs in the above. Normally we want to argue that complex things are designed.
Human designers strive to simplify things.
The initial design of a product may be quite complex because the original designer didn't have the benefit of insights gained by later experience making and using the product. Of course the systems themselves frequently get more complex with time, because new functionality keeps getting added. But take any component that doesn't change much, or a fairly mature design, and you are more likjely to see it get simpler with time than more complex.