RJ has made a number of comments and and you find many video interviews where he says the same (which among others you can find here or elsewhere:
https://www.theverge.com/2024/7/22/24203609/rivian-apple-carplay-support-rj-scaringe-decoder)
“We’ve taken the view of the digital experience in the vehicle wants to feel consistent and holistically harmonious across every touch point. In order to do that, the idea of having customers jump in or out of an application for which we don’t control and for which doesn’t have deep capabilities to leverage other parts of the vehicle experience. For example, if you’re in CarPlay and wanna open the front trunk, you have to leave the application and go to another interface.
It’s not consistent with how we think about really creating a pure product experience.”“In order to deliver the features that are desired within CarPlay, we’re starting to do that, but on an a la carte basis. So we’re just launching Apple Music in the vehicle. We have a great relationship with the Apple team. It’s in partnership with Dolby Atmos.”
“I think the biggest complaint today around the lack of CarPlay is the improvements we need to make in mapping, which are coming. But again, even in mapping, we want to be able to separately select routing, separately select base maps, separately select points of interest, overlay that with charging routing, which is really important and is highly specific to the vehicle itself and highly specific to the networks and the ratings on those networks, which we bought a route planning company to support that. We just believe that it’s such an important piece of real estate, the digital ecosystem, that it was something we want to retain.
And we recognize that it’ll take us time to fully capture every feature that’s in CarPlay. And hopefully customers are seeing that. And I think it gets often more noise than it deserves.
The other thing beyond mapping that’s coming is better integration with texting. And we know that needs to come. And it’s something that teams are actively working on.”
“We have a great relationship with Apple. I think the absolute world of their products. If I put myself in Apple shoes, imagine Apple is developing a Mac, and there was someone that had a software application, let’s maybe call it Windows.
And they said, ‘we have a turnkey platform that everyone knows how to use.’ Would they have put that in their car? Would they have developed their own iOS?
We know how that played out. So as much as I love their products, there’s a reason that ironically is very consistent with Apple ethos for us to want to control the ecosystem.”