Short sighted?
I don't get why Tesla doesn't allow authorised repair centres. When I buy a car, something I look at is where I can get it serviced and repaired. If that's in a different town, that's a ballache because car. Sure, I could get a rental from insurance or a loan car from the dealer, but both can be a PITA. For Tesla, it's a cost to build out a dealer or service network that can do things it's mobile repair trucks can't fix. I just wouldn't buy a Tesla, any EV or car unless I could get it fixed easily because Sod's Law states it'll always break at the most inconvenient time.
It seems to me that it'd build goodwill, help boost sales and save money if Tesla just offered training and parts to authorised repair shops and let them get on with it.