It wouldn't be necessary if Tesla had a competent CEO. The current one follows the "wham bam thankyou ma'am" model of doing business. That is, once he has your money for the car and you're out the door, that's all that matters.
I don't think that's true. I do think that he didn't realize how difficult it is to accomplish quality control, and when the cars turned out to have more problems than anticipated the service department was overwhelmed. The one advantage of the dealership model is that there's a far greater capacity to provide service. But the price for that is a predatory sales model and middlemen who scoop up as much profit as they can.