So they use more primer rather than the anti-chip crap. makes no difference since neither one stop chips.
GM's paint problems have been adhesion issues . either improper prep, cheap products or improperly applied, a combination .
I'm a painter and the paint on my '24 is very nice. it's laid out very nice and less orange peel than most factory paint. obviously it's not very old but it's still flawless, the high clearance running boards and Weathertech flaps completely protect it from the large amounts of gravel it sees. after reading some horror stories I was concerned about GM's paint, it looks like they got their act together.