You are basically saying "intelligent design" did not happen because we evolved via natural selection which ignores the point that irreducible complexity indicates that we didn't evolve that way.
"Intelligent Design" and " irreducible complexity" are garbage. They essentially teach that which is known to be wrong. They are not scientific or logical. They produce more problems than they solve and require a believe in a Creator (Who is always assumed, without proof, to be Yahweh.) who defies time, etc. Strangely, if an atheist were to claim such exemptions from common sense, the godbotherer would jump on him.
The fact that fingernails grow is, essentially, no more complex than the way in which an eye grew.
I don't think you can deny that irreducible complexity exists. It makes sense that complicated things would need the parts to be assembled at once in such a way that they work for it to have any functionality. A partially formed structure would have been of no use. Evolution by natural selection working on random mutations could not have assembled all the parts at once. It isn't logical that all these random mutations occurred in such a way to achieve something even intelligent people could not design, like an eye for vision.
Evolution can't explain how the first lifeform was created and evolutionist have not proven their theory that life originated on its own in some kind of chemical reaction. This is actually a key aspect of evolution, that the first lifeform just came to be due to natural processes. So to think the first lifeform could have been created, given we have no evidence life can originate from some kind of random event, is a legit theory. And if the first lifeform was created, why not many more?