I've owned and driven a few different Teslas since 2015 and I have to say it isn't always an advantage to deal with a huge company instead of a local dealership.
Remember, it was the big company who wanted to get rid of dealers and their reason was to increase their own profits.
Here is my experience: Tesla service is terrible. You can not reach a human at all and there are insufficient locations. They don't care because there is no competition. If I bought a Ford from a dealership with service this bad I would have found another local dealer that worked to get me to use them.
Tesla sales experience is also frustrating. When you buy a new car in my state you have to pay taxes on the cost difference between your trade. If I trade a $50,000 car in and buy a $100,000 car I pay 6% of the net $50,000. If I sell my own car and buy a new $100,000 car I pay the full $6,000 tax. Trading in a car to buy a new one is a very common experience and the Tesla system screws you there. I was offered a terrible deal trading in my old car in 2015 and I sold it on my own. Recently I went to trade in a Model 3 and I was offered $42,000 by Tesla. I could not shop around. I ended up selling it myself for $51,000. If there was a dealership system I'll bet someone would have offered me $46,000. Why should Tesla make an additional $9,000 or $10,000 on my trade in?