I think the argument holds. It's not about how straightforward something is, it's that evolutionary time scales are incomparable to the time it takes to purposefully invent something. The ways these goals are achieved are just too different for time comparisons to make sense. If I was living in the 19th century, I could recreate the same argument by saying that it took nature X billion years since life appeared for animals to first take flight, so surely our technology ever catching up to it is improbable if not impossible.