I thought it was more about the design in the context of working with a client to make a custom product where they tell you the purpose and give you specs, you see that the product they are asking for sucks for the stated purpose and try to point that out but they argue it. At that point, just make the product they are asking for and let them sort out the rest. It'll probably mean more money for you because they'll be back to ask for the changes you originally suggested. Or who knows, maybe they are actually right.