It seems like the manufacturer is responsible for 'integration' of CarPlay into their systems. On a recent 2021 Hyundai Sonata rental, the Carplay system crashed multiple times while driving and forced me to pull over, unpair the phone and reconnect to get it working again. I don't think I have ever used any Apple software that was this glitchy. Makes me think that there is some screwups the manufacturer can still do despite Carplay coming from Apple.