I love CarPlay, but I do feel like I'm risking my family's life when it fails to connect and I'm left fiddling with it while driving. It seems like what GM's doing would at least eliminate that risk factor.
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Other implementations (looking at you Hyundai) crash requiring you to pull over, disconnect the phone, reboot the infotainment and then re-enter your navigation destination.
The best implementation is no carplay: instead use an AUX port and mount the phone on the dash.
Second best is Tesla's custom navigation. They do something other car companies should: use one of the million speakers in the car to focus on navigation directions while allowing audio content to continue playing on all the other speakers. Such a simple idea but so good.