You've got it backwards. Buying a Rivian or Tesla means you're locked in to servicing the car with the company you bought it from, and have nowhere else to turn if you're unhappy with that service. Buying a car from a make with a dealership network means you can get it serviced anywhere, and never have to deal with the company that sold you the vehicle again if you prefer not to.
That’s a nice “in theory” take. In reality, you end up fighting the manufacturer over what may be considered in warranty v not, and the dealership is usually a pure middleman with a vested interest to make sure their money arrives.
