As others have posted, the dealership service department and sales department are separate entities.If manufacturers did move to direct-to-consumer sales how would buyers have the vehicles they bought worked on and maintained? I thought a large part of dealer showrooms was the repair facilities.. Or would there be manufacturer garages built that did nothing but work on cars, with no salespeople?
As @The Critic pointed out, Tesla has a network of service centers. The vehicles can be test driven and you can get information at Tesla stores; those "stores" carry no inventory. There is no difference between ordering from Tesla.com or at a store. Tesla also offers test drives at locations where there are no people. You are all on your own.
The other nice thing about Tesla is they will often send out a service tech to your home. A tech came to my home when the 12v battery (controlled door locks and more) in our '18 M3 Mid Range started to kick the bucket. A message came up on the tablet screen and I scheduled an appointment for the next day right there. The tech replaced the battery and inspected the car. No service charge, it was like $120 all in for the battery.