It's all overall cost. This truck has to hit a price point for Ford so they reduce the number of options available and attempt to put together packages that reduce the number of manufacturing permutations. The organizational complexity in adding separate add-on for each trim level is staggeringly expensive.Is the lariat the only trim with the signature lighting? If so what is in that part of the headlight on the other trims? Just chrome plastic? I hate when cat companies do this, just offer a lighting package.