Here? Way back there in this thread it was talked about, including the BMW paint flap you mention. How the paint these days does not hold up like the old paint did. It was discussed quite a bit.
Water-borne paint is the dominant paint process in the US. I don't know about Korea. And I don't know how an individual vehicle when purchased used can be determined as to which paint process, solvent-borne medium solids (MS), solvent-borne high solids (HS), or water-borne, the buyer is getting.
HS is less environmentally impacting than MS; and water-borne is the most environmentally friendly. There is no way that water-borne paint is going to hold up like HS or MS.
Regardless, the Stinger process is new, vis-a-vis new factory setup; so impurities can get into the painting process before they are discovered and eradicated. Those here who assert that Kia's painting process on the Stinger is crap/cheap have the burden of proof: and the evidence clearly does not support such an assertion. Very few Stingers have paint failures. Those few which exhibit "blistering—bubbling, pitted, or swollen appearance [can be attributed to these kinds of] causes: Trapped solvents; painting over dirt or moisture."
Evolution of the Automotive Body Coating Process—A Review If a car comes back from a body shop and soon manifests these problems, painted over rust can also be a culprit. But these problems are rare, therefore Kia's painting process on the Stinger is not at fault; but temporary contaminants as the painting process is nailed down could be.
@TwiceStung Now, Durability, that is a whole nother subject.