The watchmaker analogy

[Angrboda]

Simplicity is the hallmark of design, not complexity.

The problem with this is that we find examples of simplicity in nature. Neither complexity nor simplicity point infallibly toward objects that are the product of design. That's the whole problem. Nothing specific points unerringly toward things that are designed; regardless of what property you choose as an indicator of design, there will always be exceptions. That's why the design argument fails, because there is no 'hallmark' of design that points to design and design alone. Thus for any property you choose, if an object has that property, it isn't necessarily the case that the object was designed. Thus, for any property that you find the universe displays, it isn't necessarily the case that it points toward the universe being designed. The lack of a property which indicates design is the main flaw with the design argument.