The word "unboxed" is mentioned in this 
, and it is a word that has been given new meaning by what Tesla is doing: their new unboxed manufacturing approach to car building makes it so more people and robots can work on the same car at the same time, which makes for a faster assembly, better quality, and less cost.
While it is true that local optimizations have less effect than global ones, Tesla has consistently proven that it is the compounding of all local optimizations that adds up once the global optimizations take place. In fact, it is the local optimizations that make it possible for the global optimizations to be more effective!