I don't know about Rivian, but I'm generally less distracted on the road with CarPlay due to Siri & Voice Control. I wish I could extend it to my native car controls such as climate control etc.
Yeah, I actually use a cell phone mount for navigation since my car doesn't have one. It's far from ideal, and I think more cars should have an easier and more secure way to attach/clamp a phone/tablet rather than require the driver to use their infotainment system, Although that can sometimes be fine. Having a flimsy car mount can be worse/more dangerous than a limited or poorly updated in-car navigation system.
https://github.com/hatonthecat/Open-Source-Car/blob/main/ssr...