I don't think that Kia is engaging in this in any egregious manner. Capitalism creates these tipping points where a process (including all the materials involved) economizes too far: then the product gets returned, both by the factory up the line and by the consumer for warranty claims, etc. Did Kia push economizing too far with the Stinger? Maybe so. The MY19 surely took what they learned from this year and made changes; but probably only barely; it is the way of the economist. All of our material goods are delivered by economists. The only exceptions, particularly where cars are concerned, are magnitudes more expensive; exclusive.
There are two choices here: take matters into your own hands or deliver every flaw, fault and failing back to Kia.
I took the former approach, as soon as I realized (on this forum) that paint on the Stinger was comparatively delicate, if not outright failing. I gave my Silky Silver a good going over, dotted some touch up paint on the newest road damage specks, and got my full frontal PPF installed pronto (well, three months "too late"

). I could tell that three more months would just pile on the touch up spots. I've been completely satisfied with my decision, and even contemplated covering the entire car. Is this Kia's "fault"? Their paint caused me to act; so in a way they are to blame for my feeling the need to proceed with the added protective measures and expense.
All I was suggesting is that if you decided to add PPF, and since you have a headlight assembly "rub" issue already, that it would make more practical sense to do the touch up yourself, then get the PPF on right over the lip of the assembly opening so that no future rub causes any trouble.
The second choice means that you'll take your car in, get the rub fixed via a body shop, and be without your ride for weeks (if the bulk of others' experiences is an accurate prediction). I know what I'd do. And making Kia "pay" for every flaw that is attributable to them isn't something that I want to watch for and live with the whole time I enjoy this car.