I also don't like this. Maybe someone can put together some simple kits for olde skool receivers and/or satellite. Adventure folks aren't always in good cell reception areas, especially since it is AT&T only AFAIK.
You just drive wherever you want to go with a Rivian employee in the vehicle with you. They are trying to keep the driving time down to 30 minutes, so it would be helpful to figure out where you want to drive before you are driving. BTW, it drove GREAT!