But I must insist: "building a car" is not hard (millions of children do so every year with Pinewood derby style box car kits), building a "real car" that you can use and that passes regulations is harder, but knowing the difference between the two is where the real hard work is.

The truly difficult work is knowing when your client/boss asks you to "build a car," do they really just want/need a small Pinewood derby box car as a toy, do they need a four-door sedan that can legally drive on major highways, an 18-wheeler freight truck, or do they actually need/want a bicycle, or a shopping cart, or a railroad box car, or information about how to take public transit that will serve them cheaper and easier than anything you could build in their timeframe and budget.

That's what people mean when they say that code was never the hard part.