In fairness: Tesla uses the same shipping companies as everyone else. A fraction of vehicles (I believe when I looked into it it was about half a percent) develop cosmetic damage at some point during the shipping process. With a dealership, though, when cars arrive they inspect them all for damage, and any with damage go in for repairs before they go out to the lot. Customers never see the damage; it's already fixed and hidden before the car shows up on the lot. With Tesla's lack of "dealership lots", all of the warts of car transport are exposed to the customers. If you're unlucky enough to get a car that gets damaged, you absolutely will know about it. And be stuck waiting.
People need to remember this: dealerships frequently hide shipping damage from you. Usually just paint scratches or the like, but I've even seen some really egregious examples.