I had a 3 reserved (current S owner) and when Tesla was doing their year end sales push, got an invite to the local service center for a test drive. Service center had 3 cars parked inside like a showroom (X, S, 3) and a person that rode with us on the test drive. Obviously if I wanted to buy, it would just go back to an online experience.
Seems like Tesla is just seeking efficiency by turning a small part of service centers into "show rooms" and test drives with minimal space + staff. Those mall based showrooms were designed to gain exposure for a relatively rare product back in the day. Now with tons of 3s running around on the road, its really just going back to your classic dealership setup. Difference is just much bigger service, little show room, and all Tesla owned.