OK, 5/100 (mistyped that), but 5/100 is still powertrain only.
Most people won’t go 100K in five years (national average of about 10k miles per year). They will, however, do it in 10 years. Many people find it telling that GM isn’t willing to match the time period of the Korean warranties. Essentially, the message they’re sending is that after 5 years or 100K, they expect the car to fall apart.
Do you find it "telling" that no one else offers it, either? The Korean makes have made tremendous strides in less than a decade, as far as build quality and styling, but the truth is, resale is hideous on Hyundais and Kias. It becomes absolute bargain basement, after that vaunted warranty expires. That warranty was a necessity, in order to overcome the resistance to an off-brand make, as well as the really crappy first generation Hyundais with the cardboard interior door panels.