Not defending the gaps, but "most of the design tolerances" != "all design tolerances". There's much more to a car than just cosmetics. And I'm not claiming that those non-cosmetic parts are all top quality, just that it's possible that they are.
> Our car needs to be designed and built with such accuracy and precision that, if an owner measures dimensions, panel gaps and flushness, and their measurements don’t match the Model 3 specs, it just means that their measuring tape is wrong.