I hate how GM cripples each car's infotainment system in an attempt to get you to upgrade to a new car for Carplay. I get it, but I don't like it. That infotainment system is just a small box under the dash. I'd love to be able to pull that box out and drop in an upgraded Carplay compatible version...instead of replacing the entire car.
Nobody is forcing you to buy a new car or use Carplay. Its just an added feature for those who happen to be purchasing one.