Here is my take on what Tesla is doing, and it's just conjecture on my part.
Tesla is spraying the doors at a different time than the unibody. This is why the doors are a different shade than the body. Any legitimate body shop will tell you that despite mixing a paint color to be perfectly matched to the color code, the paint shade can and will still be slightly different than another batch mixed at a different time. So for Tesla to paint the doors at a different time with a different batch of Pearl White is a gamble, and the results are what we see: the doors on many MYs do NOT match the rest of the car.
Tesla is also spraying fewer coats of paint, or they don't have their robots programmed to do complete and even coat sprays as they pass over the cars and doors. I have seen far too many "splotchy" paint jobs to believe that this is a "one-off" flaw or mistake on Tesla's part.
Considering Tesla is cranking out as many MYs as they can to meet their quarterly goals, my argument that Tesla is "going cheap and fast" on the paint job is even more believable.
But then again, some accuse me of being a conspiracy theorist. hahahahaha
I sit here with an order in for a white MY with Induction wheels becuase I thought the white/black color combination looked awesome, but I do now believe the safest color to order is the MSM. I feel like there have been the fewest complaints about MSM paint issues than the other colors. Oh, maybe black also is one of the safer colors to order, but I would never consider owning a black car. So at this point I am considering changing my order from white to MSM.