You're saying that a customer can't sue companies that don't have a physical presence in their state, but because they sell their product though an unrelated third party I can sue them? I'm not a lawyer but that sounds like bullshit.

The real reason for the continued existence of car dealerships is lobbyist money. The NADA is very politically spendy to maintain their members' legally required middleman status. And it's bullshit. I can buy a laptop directly from Apple. I can buy a bicycle directly from Cannondale. I legally CANNOT buy a truck directly from Ford. I can configure it etc online but the order is then sent to a local dealership for processing and they can add whatever "fuck you because we can" fees they want.