I love CarPlay/AA, and maybe this is hyperbole but not doing CarPlay/AA isn't that crazy of a decision. Tesla, GM, other big automakers have done this too.
Idiots.
It’s also just more lucrative to drive people to use the built in stuff instead of mirroring their phone, both for easier data mining and for pushing users into subscriptions.
And yet it still makes borrowing a Tesla a pain.
Address book syncing is the main issue. I want my contacts on my phone. So taking phone calls gets a bit awkward, though with Siri getting a little better it’s sort of doable.
Other than that it’s the constant re-typing of destinations from the calendar.
Minor stuff. Hence a pain, not a problem.
Arguably they could have switched over at some time, but they're doing well enough that they haven't felt the need.
But I'd be surprised if there isn't a Tesla somewhere in the bowels of Musk's volcano lair that has CarPlay running, just waiting for the right time to release it as a software upgrade option (only $1000!).