Because it is actually not easy?  Keep in mind Apple has unprecedented resources so not easy is not really a problem for them, as Musk pointed out recently they&#x27;ve hired thousands of people to work on this.  Also I think it has been done to some extent, Tesla&#x27;s Model S is now (by some measures) the bestselling luxury car, and can probably be credited with accelerating BMW and Porsche moving towards all-electric vehicles.