It’s not, like I said I’ve seen trucks with multiple types of decals on either side and ones with chrome moldings on one side but not the other. The dealer doesn’t do that
I was referring specifically to the headlight picture in this case, but it doesn't matter. There could have been damage caused on the lot or during unloading, and the dealers may still be responsible if some of the panels had to be repainted. The decals could have been removed for the painting, and the dealership decided they didn't want to pay for a whole new set (doubt you can buy just one side) to add them back. Even if you can buy one side, I could see some being super cheap and not doing it. Same with the molding, removed for paintwork/dent repair, and then not put back on. Or they ordered the wrong set, and applied it to one side anyway.
I am not arguing that the factory didn't do some of this, do not get me wrong, I'm just playing devil's advocate and saying I'll trust the factory long before I trust the dealership. I bet some or a lot of these are dealerships fixing (badly) their own screwups.