Since when are independent shops no longer an option? I just checked their site and it says you can take it to independent shops, but risk warranty.
I can't speak to the work that would be done on it, but in a proof is in the pudding type of guy (being an engineer myself, who also used to do most of the work on my car) and the evidence seems to suggest people are happy with their Teslas, not so much with their printers.