the customer is wrong
i think your very right about this, there are such thing as **** shops but ultimately you have customers that actually resist good design as if it somehow makes the vehicle or company less their own.
i was trying to wrap a small box truck for a family member and he was married to this ****ty font he found on microsoft word and a gradiant backround he "made". Some people have grown there businesses to a certain level by micromanaging labor and cant get past the idea that they are not the smartest person in the room anymore in regards to design