Nothing man has ever designed has been irrucedibly complex. And I do think man would qualify as an "intelligent designer".
Take any invention, and look at it. You'll find out that the parts it consists of are either other inventions, or raw material.
Take a Boeing 747 for example. In order to make it you need technologies from a multitude of science fields. Within each field several hundreds of years of slow accumulation of knowledge are needed. Where each part of new knowledge is based on that was known before. And at no stage in this process is it impossible to go the the next stage, since each step is small.
Hmm thats strange... it sounds just like... yeah, thats right evolution.
There is one problem with irreducibly complex systems and that is that the only such system that can exist is the one that can't be put together in the first place. (By anything.)
See if a system has parts, then it must have an order in which it was assembled. Thus you can reverse that order and dismantle it. Both literally and conceptually. Otherwise the system could not have been built. In other words the process of creation would have taken another path.
That is why arguments from design are dumb. Design is not magic. It's a slow process built upon previous accumulation of knowledge and experience. It's a process of selection. Just like any evolutionary process is.
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