A very reasonable opinion and way of doing things O-G. And also not the way California works. Unless you can take delivery and depart the state without taking advantage of any services of the state (charging station, restroom, ...) and prove it (very unlikely they will believe you aren't going to stop for dinner), they will be collecting California sales tax. Bums me out they do things that way - I'd love to take delivery in Fremont and drive home to Oregon, but alas.
I've even written to the Board that manages the Use Tax, and pointed out that they COULD be building up a new angle on the state tourism business. Think of how many US market owners would bring the family to California for the factory tour, pickup their car, and then drive it home; probably with a stop by Disneyland, Hollywood, drive up the coast, etc.. etc.. And think of how desirable Tesla owners are to have come do touristy things in your state.
Then Tesla would need to get to work, or outsource to a third party, the building of a package for overseas buyers. Come to California, pickup your new Tesla, drive it around for a month or 2 on your summer vacation; then drop it off on the East or West coast to be shipped back to your home and delivered to you there. BMW has that going, and I've read some awfully good stories from people who think that Germany is the only place to pickup a new one.
They could even avoid making major alterations to the state law - add in a 30 day registration that manufacturers of cars manufactured in California can issue as part of delivering a car (no dealers, only manufacturers), that can't be extended, and can only be issued to people that can in some way demonstrate that ultimate registration of the vehicle is somewhere other than California. Charge $100 for it - get some direct revenue for the state, get some more sales tax revenue from people vacationing at least partially in the state, and it'll all be revenue the state of California won't otherwise get. Sure seems like a good idea to me.
Any Use Tax Board folks reading this, feel free to claim the ideas in this post as your own, and just do it! Preferably in the next month or two so I can drive my Model X back from Fremont!