They offer their own navigation software to automatically plan charging stops on long trips, but for most trips I just want Waze and their excellent traffic aware routing and speed trap notices.
In addition, Tesla's screen is the only interface to the car's critical functions. They're not gonna hand it over to CarPlay unless they were to provide a separate screen for the purpose.
This is like people who think that by using one browser you must "switch" and get rid of the others... no.
But the latest updates of the Tesla stuff are great so I can't remember the last time I used Waze.
CarPlay, I can't speak to, but I find the built-in music features just fine.