I hear you on the part about being able to drop into a rental car and go, but that's not unique to CarPlay. That's the same experience for Android Auto, and theoretically would be the same experience for AAoS as it rolls out to more makes and models. You would just log into your Google account, and voila, you have access to EVERYTHING, not just in the car, but throughout your Google connected account.They probably want to send their time doing things like going to the beach or socializing. I’ve been in the tech industry over 40 years and like my apple devices because they just work, together. I can do something on my iPhone and my iPad knows about it, set up a streaming service in our Apple TV and it’s always synched to the other devices.
It’s the same with the car; I just want my phone connected to the car. CarPlay is good because it’s a standard across the auto industry. If you own multiple vehicles its the same interface in them all, and synched with your other devices. If you hire a car no need to learn someone else’s infotainment or navigation system, just connect your phone.
Understand if you‘re not into the Apple ecosystem that isn’t attractive but it you are it’s really a big deal not to have it. For sure not having CarPlay will be costing Polestar sales.
Apple is fine, especially if you want to stay within that eco-system, but by design it's more restrictive and limited than what Google/Android allows for, and I don't think it's any secret that that's why any sort of Apple equivalent to AAoS would be a non-starter for most manufacturers.