As an owner of a Tesla, here's my take:
1. Hell has frozen over.
2. Elon is smart, even though he's a jerk. He knows it will boost Tesla sales, and he needs that now that the EV tax credit is gone.
3. CarPlay will be in a sandboxed window within the interface. This is totally fine.
4. Tesla's infotainment system is better than CarPlay in every way EXCEPT I can't choose the mapping system I want. Tesla's is good, but it's not as good as Waze and/or Google Maps. For my needs, I'd prefer Waze, as I get the "Police ahead" alerts.
5. Regardless, I, and most people, will probably not use CarPlay even if they add it. And most buyers who are sold on the CarPlay integration will most likely switch to just using Tesla's integrated system. Elon knows this, which is why they are adding it... because in the end it's a non-factor. Why?
- Tesla's system automatically includes Supercharger stops along a long-distance route. Not only that, but it gives you extreme details about how long it will take to charge, how long the wait is, battery levels upon arrival, etc etc. It's all integrated. CarPlay can't do this.
- Tesla's system also has all kinds of other navigational necessities, like using navigational data for Supervised Self-Driving to get you from point A to point B. CarPlay can't do this.
- Tesla's system is extremely easy to use. In my opinion, as easy as CarPlay.
This is a win-win-win for Tesla, Apple, and consumers, and in the end I think Tesla wins the most.
And just to throw in my opinion about Tesla cars: I love my Tesla. It's the best car I've ever owned, and I'm 46 and have owned countless cars, including Honda, Toyota, Mercedes, Chevy, and so on. I've also rented 100's of cars as I fly nearly 60 times a year. I don't understand the hate with them at all. I've taken it on 5-day cross-country loops around the USA with no charging issues in rural states like Mississippi and Arkansas. I've done 1000's of hours on self-driving without a crash or major mishap. I've got one of the fastest cars ever made for under $50k. I have no maintenance... no oil changes, no brake pads, no fluids at all. Zero maintenance besides tires. My car has over 100k miles on it with no battery issues. I'll continue to buy Tesla as long as they have these advantages over other manufactures, point blank. I genuinely don't understand the hate, and I feel like most people who don't like them have never driven them for any extended period of time. It's literally the best car purchase I've ever made.